CN216036263U - Quasi-zero rigidity honeycomb core vibration reduction packaging structure - Google Patents

Abstract

The utility model discloses a quasi-zero-rigidity honeycomb core vibration-damping packaging structure, and relates to the field of design of transportation vibration-damping packaging structures of foods, fruits and vegetables, drinks, precision instruments and the like. The quasi-zero rigidity honeycomb core is formed by a cell linear array formed by connecting a negative rigidity double-curved beam and a positive rigidity conical curve wall in parallel, and based on the principle of positive and negative rigidity parallel connection, the whole structure has the quasi-zero rigidity characteristic, so that low-frequency broadband vibration reduction can be realized, and the bearing capacity of the honeycomb core is not influenced. The quasi-zero-stiffness honeycomb core vibration attenuation packaging structure is made of a nylon-based viscoelastic material or a super-elastic metal material, is integrally prepared and molded by using a 3D printing technology or a cutting technology, has high specific energy absorption and certain recoverability, and is expected to make up for the defects that the existing vibration attenuation packaging structure is narrow in effective low-frequency vibration attenuation bandwidth, cannot be reused after absorbing energy in a plastic deformation mode, and the like.

Description

Quasi-zero rigidity honeycomb core vibration reduction packaging structure

Technical Field

The utility model relates to the field of design of transportation vibration-damping packaging structures of foods, fruits and vegetables, drinks, precision instruments and the like, in particular to a quasi-zero-stiffness honeycomb core vibration-damping packaging structure which is high in specific energy absorption and has recoverability.

Background

The vibration is widely existed in nature, a large amount of product breakage and vibration reduction packaging function failure phenomena occur particularly in the transportation process, and the economic loss caused by the product breakage due to improper packaging protection reaches hundreds to hundreds of billions yuan each year. The existing transportation vibration reduction package comprises a corrugated case, a honeycomb paperboard, a paper pulp molding, an air cushion film, a foam plastic and the like, the research on product protection under low-frequency vibration and impact environments is weak, and the low-frequency vibration protection performance of the product package needs to be improved urgently. For example, in the field of fruit and vegetable transportation, the natural frequency of the fruit and vegetable is about 50Hz, the excitation frequency generated in the transportation process is about 2-5Hz, and the high intensity and high transmissibility of the vibration in the range enable the fruit and vegetable to be under low-frequency vibration for a long time, so that fatigue damage is caused, and the quality and the eating period of the fruit and vegetable are seriously influenced. In the field of transportation of wine and precision instruments, the requirements on low-frequency and ultralow-frequency vibration reduction protection are stricter. In order to ensure the quality and the service life of the product, reduce the frequency of vibration and impact on the product and reduce the damage degree of the product, the low-frequency and ultra-low-frequency protection is particularly important. In addition, most of the existing vibration-damping packages absorb energy through plastic deformation, so that the recycling of the packages is hindered, the waste of resources and cost is caused, and the requirements of environmental protection are not met.

As a novel nonlinear low-frequency vibration reduction technology, the quasi-zero stiffness vibration reduction technology provides a new idea for solving the vibration reduction problem of products in the transportation process. In addition, with the rapid development of additive manufacturing technology, in recent years, mechanical superstructures have been proposed and implemented in the fields of energy absorption and vibration damping, which are of great interest because they have specific mechanical properties different from those of conventional structures. Based on the method, the quasi-zero-rigidity honeycomb core structure formed by reasonably designing the honeycomb core cells and carrying out ordered array is expected to show better low-frequency vibration reduction protection performance in the transportation field.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the existing transportation vibration damping package, the utility model provides a quasi-zero-rigidity honeycomb core vibration damping package structure, which can effectively improve the low-frequency vibration damping effect of the package structure in the transportation process, has certain recoverability and can be repeatedly used; and (3) carrying out integrated preparation molding by a 3D printing technology or a cutting technology (including water cutting, laser cutting and the like). Compared with the existing vibration reduction package, the low-frequency protection can be effectively realized, the functionality is stronger, and the presentation form is more flexible.

In order to achieve the purpose, the utility model provides the following technical scheme: a quasi-zero rigidity honeycomb core vibration damping packaging structure is characterized in that a honeycomb core is formed by a cell linear array formed by connecting a negative rigidity double-curved beam and a positive rigidity conical curve wall in parallel, and based on a positive rigidity and negative rigidity parallel principle, the whole structure has a quasi-zero rigidity characteristic, so that low-frequency broadband vibration damping can be realized, and the bearing capacity of the structure is not influenced.

Specifically, the honeycomb core cell element comprises a double-curved beam, a conical curve wall, an upper pressing plate, a lower pressing plate and a reinforcing wall, and the upper part and the lower part of the honeycomb core cell element are in an axial symmetry structure.

Specifically, the hyperbolic beam is used for providing negative rigidity, the conical curve wall is used for providing positive rigidity, the hyperbolic beam and the conical curve wall are in an orthogonal direction and are connected, and the positive rigidity and the negative rigidity are connected in parallel, so that the cell element has a quasi-zero rigidity characteristic.

The working principle is as follows: when the single-curved-beam-type spring energy-saving loading and unloading device is used, when the single-curved beam generates nonlinear large deformation under the action of external load, an elastic buckling step phenomenon occurs, in the process of 'kick', the rigidity is subjected to a negative-value stage, namely, a negative rigidity effect is shown, and energy dissipation in the loading and unloading process is realized. However, the single-curved beam is easy to twist under the action of load, so that the negative stiffness effect is prevented from being shown, and the energy absorbed by the structure is reduced. When the double-curved beam is adopted, the double-curved beam is beneficial to limiting the jump of the curved beam between the first-order buckling mode and the third-order buckling mode, the occurrence of the asymmetric buckling mode is avoided, the negative rigidity behavior is promoted to be shown, the energy absorption capacity of the honeycomb core is improved, and therefore the double-curved beam is selected as a mechanism for providing the negative rigidity. The conical curve wall comprises an elliptical wall, a hyperbolic wall, a parabolic wall and the like, not only shows excellent stability, but also has higher static bearing capacity, and shows a positive rigidity characteristic under the action of vertical load, so that the conical curve wall is selected as a mechanism for providing positive rigidity. When external load acts, based on the principle that positive rigidity and negative rigidity are connected in parallel, positive rigidity generated by the conical curve wall and negative rigidity generated by buckling of the hyperbolic beam are offset, so that the cell element has the quasi-zero rigidity characteristic, the whole structure can realize high static and low dynamic, low-frequency broadband vibration reduction is realized, and meanwhile, the bearing capacity of the cell element is not influenced. In addition, a nylon-based viscoelastic material or a super-elastic metal material is selected, the 3D printing technology or the cutting technology is utilized for integrated preparation and molding, and the viscoelastic, super-elastic and mechanical superstructure design of the material allows the honeycomb core to be reusable after multiple loading and unloading cycles.

Has the advantages that: the quasi-zero rigidity honeycomb core vibration reduction packaging structure provided by the utility model has the presentation forms including but not limited to a box, a cylinder and a pad, can be changed according to specific conditions, further realizes multidirectional vibration reduction, reduces the direct influence of vibration or impact on packaging in the transportation process, and effectively reduces the generation of mechanical damage of products. The quasi-zero rigidity honeycomb core can effectively improve the low-frequency vibration reduction effect of the packaging structure in the transportation process, and meanwhile, the bearing capacity of the packaging structure is not influenced. The nylon-based viscoelastic material or the super-elastic metal material is selected and integrally prepared and molded by using a 3D printing technology or a cutting technology. In addition, the quasi-zero-stiffness honeycomb core vibration attenuation package structure has high specific energy absorption and recoverability, and can make up the defects that the existing vibration attenuation package has narrow effective low-frequency vibration attenuation bandwidth, cannot be reused after absorbing energy in a plastic deformation mode, and the like.

Drawings

FIG. 1 is a front view of a package according to an embodiment of the present invention;

FIG. 2 is an internal cross-sectional view of a quasi-zero stiffness honeycomb core shock absorbing package;

FIG. 3 is a schematic view of the structure of a honeycomb core;

fig. 4 is a schematic diagram of a cell structure;

in the figure: 2-1, side wall; 2-2, a bottom plate; 4-1, an upper pressing plate; 4-2, a hyperbolic beam; 4-3, reinforcing walls; 4-4, circular wall; 4-5, and a lower pressing plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments; it should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

The example relates to a hyperbolic beam-circular wall quasi-zero rigidity honeycomb core vibration-damping packaging box, namely the external part of the box-type structure is shown in figure 1. The nylon-based viscoelastic material is integrally prepared by a 3D printing technology, and the viscoelastic material shows a hysteresis effect due to asynchronous stress and strain when subjected to alternating load, so that the structure generates energy loss and has reusability.

Specifically, an internal cross-sectional view of a quasi-zero stiffness honeycomb core shock-absorbing packing case, see fig. 2; the side wall 2-1 and the bottom plate 2-2 are honeycomb cores and are formed by linear arrays of cells, which are shown in fig. 3; the cell element is composed of an upper pressing plate 4-1, a hyperbolic beam 4-2, a reinforcing wall 4-3, a circular wall 4-4 and a lower pressing plate 4-5, and the upper part and the lower part of the cell element are in an axisymmetric structure, as shown in figure 4. The circular wall 4-4 is used as a mechanism for providing positive rigidity, the hyperbolic beam 4-2 is used as a mechanism for providing negative rigidity, when an external load acts, the positive rigidity generated by the circular wall 4-4 is gradually offset with the negative rigidity generated by the hyperbolic beam 4-2 based on the principle that the positive rigidity and the negative rigidity are connected in parallel, so that the cell element has the characteristic of quasi-zero rigidity, the whole structure can realize high static and low dynamic, the low-frequency broadband vibration reduction of the whole structure is ensured, the bearing capacity of the whole structure is not influenced, and the vibration reduction effect of the bottom plate 2-2 in the low frequency direction in the vertical direction is effectively improved; the side wall 2-1 of the packing box is also of a quasi-zero rigidity honeycomb core structure, so that impact and mutual collision in the transverse direction are avoided, and the multi-direction vibration reduction effect of the packing box can be improved. In the unloading process, the structure is gradually restored to the original shape by virtue of the viscoelastic and mechanical superstructure design of the material, namely, the reusability is shown to a certain degree.

Specifically, referring to fig. 4, a schematic diagram of a cell structure is shown, which includes: an upper pressing plate 4-1, a hyperbolic beam 4-2, a reinforcing wall 4-3, a circular wall 4-4 and a lower pressing plate 4-5. The single curved beam is a prefabricated stress-free curved beam, the shape of the single curved beam is similar to that of a cosine beam, two concentric single curved beams are coupled at the center of the top to form a double curved beam 4-2, the curved beam is forced to jump between a first buckling mode and a third buckling mode, the occurrence of asymmetric buckling modes is limited, and the occurrence of a negative stiffness effect is promoted. The left end and the right end of the upper double-curved beam and the lower double-curved beam are respectively tangent to the horizontal direction and fixed by the reinforcing walls 4-3, so that the transverse expansion of the curved beams is avoided to prevent the occurrence of negative stiffness effect. In addition, the circular outer wall 4-4 is tangent to the center of the lower end of the hyperbolic beam 4-2, so that the integrated preparation by a 3D printing technology is facilitated, and the method is simple, convenient and quick.

The hyperbolic beam is used as a mechanism for providing negative rigidity and mainly plays a role in energy consumption; the conic curved wall is used as a mechanism for providing positive rigidity and mainly plays a bearing role.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and different external structures can be prepared or the structural parameters of the honeycomb core cells can be optimized according to actual requirements, so that the quasi-zero stiffness honeycomb core vibration damping package structure can meet the requirements of bearing capacity, energy consumption and vibration damping under different applications.

Any equivalent embodiment that may be changed or modified into equivalent variations by those skilled in the art may be applied to other fields without departing from the technical spirit of the present invention, and any simple modification, equivalent change and modification, and external form change made to the above embodiment according to the technical spirit of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims (3)

1. The utility model provides a quasi-zero rigidity honeycomb core damping packaging structure which characterized in that: the honeycomb core is formed by a cell linear array formed by connecting a negative-rigidity double-curved beam and a positive-rigidity conic curve wall in parallel, and the whole structure has a quasi-zero rigidity characteristic based on the positive-negative rigidity parallel principle, so that low-frequency broadband vibration reduction can be realized, and the bearing capacity of the honeycomb core is not influenced.

2. The quasi-zero stiffness honeycomb core vibration damping package structure of claim 1, wherein: the honeycomb core cell element is composed of a double-curved beam, a conical curve wall, an upper pressing plate, a lower pressing plate and a reinforcing wall, and the upper part and the lower part of the honeycomb core cell element are in an axisymmetric structure.

3. The quasi-zero stiffness honeycomb core vibration damping package structure of claim 1, wherein: the hyperbolic beam is used for providing negative rigidity, the conical curve wall is used for providing positive rigidity, the hyperbolic beam and the conical curve wall are in an orthogonal direction and are connected, and the positive rigidity and the negative rigidity are connected in parallel, so that the cell element has a quasi-zero rigidity characteristic.

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