Honeycomb bionic elastic vibration isolation pad structure

Abstract

The utility model discloses a honeycomb bionic elastic vibration isolator structure, and belongs to the technical field of vibration isolators. Comprising a mounting plate composed of an upper mounting plate and a lower mounting plate; the first-stage vibration reduction mechanism adopts a closed hole type polyurethane vibration isolation pad with an internal honeycomb-like structure; and the second-stage vibration reduction mechanisms are arranged in the vertical through holes, and each second-stage vibration reduction mechanism is arranged in the corresponding vertical through hole. Under the conditions of low load and medium-high frequency vibration, the low load and medium-high frequency vibration can be effectively attenuated due to the fact that closed holes of the closed hole type polyurethane vibration isolation pad of the honeycomb-imitating structure have large deformation capacity and good internal damping in the initial compression stage; good lateral rigidity support is provided between the upper mounting plate and the lower mounting plate by utilizing the matching of a guide rod and an external thread guide cylinder of the second-stage vibration reduction mechanism; under the conditions of high load and low-frequency vibration, additional supporting force is provided by means of contact between the compression spring and the limiting nut.

Description

Technical Field

[0001] This utility model relates to a honeycomb biomimetic elastic vibration isolation pad structure, belonging to the field of vibration isolation pad technology. Background Technology

[0002] Vibration control is a crucial technical means to ensure structural safety, improve user comfort, and extend equipment life in building structures, rail transit, and various industrial equipment. Polyurethane vibration isolation pads, due to their excellent elasticity, aging resistance, and plasticity, have been widely used for vibration isolation and shock absorption. Their working principle primarily involves absorbing and attenuating externally transmitted vibration energy through the elastic deformation of the material and its own internal damping, thereby reducing vibration propagation. While traditional solid polyurethane pads possess good vibration reduction performance, their dynamic stiffness changes rapidly with compressive strain, making it difficult to meet performance requirements under various loads or frequencies, especially when dealing with large-amplitude impacts or complex vibrations with a broad frequency spectrum.

[0003] To further improve vibration reduction, a honeycomb-type polyurethane vibration isolation pad has emerged in recent years. This type of product introduces closed pores with a honeycomb-like structure into the polyurethane body, enabling it to achieve higher deformation capacity and energy dissipation capacity per unit volume. The honeycomb structure can effectively reduce the overall stiffness of the pad, improve low-frequency response, and due to its internal porosity, also possess certain impact buffering performance. However, the honeycomb structure also has significant drawbacks: (1) weak lateral stiffness; and (2) limited load-bearing capacity. These not only affect the stability of vibration isolation performance but may also cause material damage under high loads, reducing service life.

[0004] Therefore, in view of the limitations of existing polyurethane vibration isolation pads and honeycomb structures in practical applications, a two-stage vibration reduction structure is proposed. Combining soft and hard vibration isolation response mechanisms, the initial flexible buffer is achieved by using low-stiffness honeycomb polyurethane vibration isolation material in the front section, and the high-stiffness composite spring layer in the rear section bears the load under high load, thus solving the problems of weak lateral stiffness and limited load-bearing capacity in honeycomb structures. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a honeycomb biomimetic elastic vibration isolation pad structure, which solves the problems of weak lateral stiffness and insufficient load-bearing capacity of current honeycomb polyurethane vibration isolation pads.

[0006] The technical problem to be solved by this utility model is achieved by the following technical solution:

[0007] A honeycomb biomimetic elastic vibration isolation pad structure includes:

[0008] The mounting plate consists of an upper mounting plate and a lower mounting plate.

[0009] The primary vibration reduction mechanism uses a closed-cell polyurethane vibration isolation pad with an internal honeycomb structure. The closed-cell polyurethane vibration isolation pad is installed between the upper mounting plate and the lower mounting plate, and the closed-cell polyurethane vibration isolation pad has multiple vertical through holes.

[0010] A secondary vibration damping mechanism is installed in each of the vertical through holes. The secondary vibration damping mechanism includes a guide rod and a compression spring coaxially suspended on the upper mounting plate, an external threaded guide cylinder mounted on the lower mounting plate and cooperating with the guide rod, and a limiting nut mounted on the external threaded guide cylinder and spaced apart from the bottom of the compression spring. The limiting nut is connected to the external threaded guide cylinder through an anti-loosening component.

[0011] Preferably, the anti-loosening component is a sleeve with an open top, a hexagonal cavity inside, and a hexagonal inner hole at the bottom. The outer diameter of the hexagonal cavity is larger than the outer diameter of the hexagonal inner hole. The bottom of the external threaded guide cylinder is provided with an outwardly expanding hexagonal base. The hexagonal cavity cooperates with the limiting nut, and the hexagonal inner hole cooperates with the hexagonal base.

[0012] Preferably, the bottom of the anti-loosening component is installed on the lower mounting plate by adhesive.

[0013] Preferably, the external threaded guide cylinder is fixed to the lower mounting plate by a provided lower thread portion.

[0014] Preferably, the guide rod consists of an upper pad and a middle rod body. The top of the pad is fixed to the upper mounting plate by an upper threaded portion, and the bottom of the rod body is provided with an internal hexagonal hole.

[0015] Preferably, the compression spring is welded and fixed to the lower surface of the pad.

[0016] Preferably, a contact ring is welded to the bottom end of the compression spring, and the contact ring is sleeved on the upper part of the external threaded guide cylinder.

[0017] Preferably, each of the vertical through holes in the closed-cell polyurethane vibration isolation pad is provided with a vent hole that communicates with the outside.

[0018] Preferably, the bottom of the external threaded guide cylinder is provided with an exhaust hole that communicates with the vertical through hole.

[0019] The beneficial effects of this utility model are:

[0020] 1. Under low load and medium-to-high frequency vibration conditions, the closed-cell polyurethane vibration isolation pad with honeycomb structure has a large deformation capacity and good internal damping in the initial compression stage, which can effectively attenuate low load and medium-to-high frequency vibration.

[0021] 2. By utilizing the guide rod and external threaded guide cylinder of the secondary vibration damping mechanism, good lateral stiffness support is provided between the upper and lower mounting plates, which makes up for the deficiency of weak lateral support in the simple use of closed-cell polyurethane vibration isolation pads.

[0022] 3. Under high load and low frequency vibration conditions, after the closed pores of the closed-cell polyurethane vibration isolation pad completely collapse, the compression spring and the limit nut contact each other to provide additional support force, which shares part of the pressure of high load on the closed-cell polyurethane vibration isolation pad and prevents the pressure of high load from exceeding the elastic deformation range of the closed-cell polyurethane vibration isolation pad. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the internal structure of the present invention;

[0024] Figure 2 This is a three-dimensional structural diagram of the secondary vibration damping mechanism;

[0025] Figure 3 This is a schematic diagram of the structure of this utility model under no-load conditions;

[0026] Figure 4 A schematic diagram of the secondary vibration reduction mechanism when the closed hole of the primary vibration isolation mechanism completely collapses;

[0027] Figure 5 This is a schematic diagram of the secondary vibration damping mechanism under compression.

[0028] Figure 6 A structural diagram showing the installation state to prevent loosening of components;

[0029] Figure 7 A schematic diagram of the structure for adjusting the state to prevent loosening.

[0030] In the picture:

[0031] 1. Mount the upper plate;

[0032] 2. Lower mounting plate;

[0033] 3. Closed-cell polyurethane vibration damping pad; 301. Vertical through hole; 302. Ventilation hole;

[0034] 4. Guide rod; 401. Pad; 402. Rod body; 403. Upper threaded part; 404. Internal hexagonal hole;

[0035] 5. Compression spring; 501. Contact ring;

[0036] 6. External threaded guide cylinder; 601. Hexagonal base; 602. Lower threaded part; 603. Vent hole;

[0037] 7. Limit nut;

[0038] 8. Anti-loosening components; 801. Hexagonal cavity; 802. Hexagonal inner hole. Detailed Implementation

[0039] To facilitate a clear understanding of the technical means, creative features, objectives, and effects of this utility model, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0040] like Figure 1 As shown, this honeycomb biomimetic elastic vibration isolation pad structure includes a mounting plate, a primary vibration damping mechanism, and a secondary vibration damping mechanism.

[0041] The mounting plate consists of a steel upper mounting plate 1 and a lower mounting plate 2.

[0042] The primary vibration damping mechanism uses a closed-cell polyurethane vibration isolation pad 3 with an internal honeycomb-like structure. The closed-cell polyurethane vibration isolation pad 3 is installed between the upper mounting plate 1 and the lower mounting plate 2, and has multiple vertical through holes 301 inside.

[0043] The closed-cell polyurethane vibration isolation pad 3 is a commercially available product. It features a honeycomb-like closed-cell structure and provides multi-level vibration isolation. The terms "high load" and "low load" as used in this article refer to: a load greater than or equal to the amount that completely compresses and collapses the closed cells of the closed-cell polyurethane vibration isolation pad 3; and a load that does not completely compress and collapse the closed cells of the closed-cell polyurethane vibration isolation pad 3.

[0044] In the initial stage, under low load, the closed-cell structure first undergoes slight elastic bending, providing low stiffness and exhibiting a soft response, effectively filtering micro-vibrations and high-frequency disturbances. During the closed-cell collapse stage, as the low load limit is reached, the closed-cell walls gradually buckle and collapse, forming a large amount of local plastic deformation. This stage absorbs a significant amount of energy, relying on its internal damping to act as an energy dissipation platform, providing good buffering against impacts or vibrations. In the high-stiffness stage, under high load, after the closed-cell structure completely collapses, the closed-cell walls are compacted into contact, and the overall structure transforms into a near-solid state, rapidly increasing stiffness and providing strong support. At this point, as the high load further increases, the high-stiffness closed-cell polyurethane vibration isolation pad 3 may exceed the load range, potentially causing excessive compression or structural damage. Therefore, to enhance high load capacity, a secondary vibration damping mechanism is added to distribute the excessively high load.

[0045] like Figure 1 , Figure 2As shown, vertical through holes 301 for installing secondary vibration damping mechanisms are opened inside the closed-cell polyurethane vibration isolation pad 3. Each vertical through hole 301 houses one secondary vibration damping mechanism. The secondary vibration damping mechanism includes a guide rod 4 and a compression spring 5 coaxially suspended on the upper mounting plate 1, an externally threaded guide cylinder 6 mounted on the lower mounting plate 2 and cooperating with the guide rod 4, and a limiting nut 7 mounted on the externally threaded guide cylinder 6 with a gap between it and the bottom of the compression spring 5. The limiting nut 7 is connected to the externally threaded guide cylinder 6 through an anti-loosening component 8.

[0046] like Figures 3-5 As shown, the state changes of the secondary vibration damping mechanism under different load conditions are as follows:

[0047] Initial no-load state: The closed-cell polyurethane vibration isolation pad 3 is in the initial no-load position, and there is a gap d between the bottom of the compression spring 5 and the top of the limit nut 7.

[0048] When the closed-cell polyurethane vibration isolation pad 3 is under high load, the closed-cell structure completely collapses, forming a polyurethane vibration isolation pad with an almost "solid" structure. Compared to the compression spring 5, the almost "solid" structure of the polyurethane vibration isolation pad has a poor ability to bear high loads. At this time, the downward-pressing upper mounting plate 1 drives the compression spring 5 to move downward and contact the limit nut 7. Since the limit nut 7 is fixed to the lower mounting plate 2, the compression spring 5 begins to compress, sharing part of the load and preventing the pressure of the high load from exceeding the elastic deformation range of the closed-cell polyurethane vibration isolation pad 3, thereby causing damage to the closed-cell polyurethane vibration isolation pad 3.

[0049] High-load compression state: In this state, in addition to the primary vibration damping mechanism being compressed, the secondary vibration damping mechanism is also compressed. Compression spring 5 and the polyurethane vibration isolation pad with a near-solid structure jointly bear the compressive force of the load.

[0050] For closed-cell polyurethane vibration isolation pads 3 with different specifications and compression characteristics, the distance between the limiting nut 7 and the bottom of the compression spring 5 can be adjusted: when the closed-cell polyurethane vibration isolation pad 3 is under load and the closed cell is just completely collapsed, the bottom of the compression spring 5 moves downward by a distance d and begins to contact the limiting nut 7.

[0051] Compression springs 5 ​​with different elastic coefficients can be replaced to meet the stiffness requirements of the high stiffness stage in different application scenarios.

[0052] In summary, this vibration isolation structure, under low load and medium-to-high frequency vibration (>10 Hz), utilizes the closed-cell polyurethane vibration isolation pad 3 with a honeycomb structure to exhibit greater deformation capacity and better internal damping during the initial compression stage, effectively attenuating low load and medium-to-high frequency vibration.

[0053] The guide rod 4 and the external threaded guide cylinder 6 of the secondary vibration damping mechanism are used to provide good lateral stiffness support between the upper mounting plate 1 and the lower mounting plate 2, which makes up for the deficiency of weak lateral support in the simple use of closed-cell polyurethane vibration isolation pad 3.

[0054] Under high load and low frequency vibration (2-10 Hz), after the closed pores of the closed-cell polyurethane vibration isolation pad 3 completely collapse, the compression spring 5 contacts the limiting nut 7, providing additional support force. This shares some of the pressure exerted by the high load on the closed-cell polyurethane vibration isolation pad 3, preventing the pressure of the high load from exceeding the elastic deformation range of the closed-cell polyurethane vibration isolation pad 3. Furthermore, the closed-cell polyurethane vibration isolation pad 3 can provide a damping effect to the compression spring 5 through its own internal damping. As an energy dissipation platform for the compression spring 5, it provides wider frequency band vibration isolation, excellent impact buffering capability, and good service life, and has broad engineering application prospects.

[0055] like Figure 6 , Figure 7 As shown, in some embodiments, the anti-loosening component 8 is a sleeve with a top opening, an internal hexagonal cavity 801, and a bottom hexagonal inner hole 802. The outer diameter of the hexagonal cavity 801 is larger than the outer diameter of the hexagonal inner hole 802. The bottom of the external threaded guide cylinder 6 is provided with an outwardly expanding hexagonal base 601. The hexagonal cavity 801 cooperates with the limiting nut 7, and the hexagonal inner hole 802 cooperates with the hexagonal base 601.

[0056] Anti-loosening state: The bottom of the anti-loosening component 8 is fixed to the lower mounting plate 2 by adhesive (3M double-sided tape, adjust the height before pasting). At this time, the hexagonal inner hole 802 of the anti-loosening component 8 is fitted onto the hexagonal base 601 and cannot be rotated. The hexagonal cavity 801 is fitted onto the limit nut 7 to prevent the limit nut 7 from rotating.

[0057] Adjustment: Pull out the anti-loosening component 8, causing the hexagonal inner hole 802 to disengage from the hexagonal base 601. At this point, rotate the anti-loosening component 8, causing the limit nut 7 to rotate. This adjusts the height of the limit nut 7, thereby changing the distance between it and the compression spring 5. The minimum adjustable angle is 60°. After adjusting to the appropriate height, fix the bottom of the anti-loosening component 8 to the lower mounting plate 2 using adhesive.

[0058] like Figure 1 , Figure 2 As shown, in some embodiments, the external threaded guide cylinder 6 is fixed to the lower mounting plate 2 by a provided lower threaded portion 602. To prevent loosening, anti-loosening thread-locking adhesive can be used at the threaded connection. The external threaded guide cylinder 6 is fixed to the lower mounting plate 2 by a screw connection, which facilitates disassembly and maintenance. For applications with frequent vibration, the external threaded guide cylinder 6 and the lower mounting plate 2 can be fixed by welding.

[0059] like Figure 1 , Figure 2 As shown, in some embodiments, the guide rod 4 consists of an upper pad 401 and a middle rod 402. The top of the pad 401 is fixed to the upper mounting plate 1 via an upper threaded portion 403. To prevent loosening, anti-loosening thread-locking adhesive can be used at the threaded connection. For applications with frequent vibration, the pad 401 and the upper mounting plate 1 can be fixed by welding. The bottom of the rod 402 has an internal hexagonal hole 404, and the compression spring 5 is welded and fixed to the lower surface of the pad 401. By inserting a hexagonal wrench into the internal hexagonal hole 404 at the bottom of the rod 402, the upper threaded portion 403 can be installed in the threaded hole of the upper mounting plate 1. The bottom of the pad 401 is welded and fixed to the compression spring 5, and the top is fixed to the upper mounting plate 1. This not only forms an anti-tilting support with the external threaded guide cylinder 6, but also allows the compression spring 5 to press the guide rod 4. The higher the load, the more stable the guide rod 4 becomes.

[0060] like Figure 1 , Figure 2 As shown, in some embodiments, a contact ring 501 is welded to the bottom end of the compression spring 5, and the contact ring 501 is sleeved on the upper part of the external threaded guide cylinder 6. The contact ring 501, which cooperates with the external threaded guide cylinder 6, can further improve the accuracy of the contact between the compression spring 5 and the lower limiting nut 7, prevent the compression spring 5 from deviating, and make the compression process more stable.

[0061] like Figure 1 As shown, in some embodiments, each vertical through hole 301 of the closed-cell polyurethane vibration isolation pad 3 is provided with a vent 302 communicating with the outside. The bottom of the externally threaded guide cylinder 6 is provided with an exhaust hole 603 communicating with the vertical through hole 301.

[0062] If the above-mentioned vent 302 and exhaust port 603 are not provided, then under load, the interior of the vertical through hole 301 of the closed-cell polyurethane vibration isolation pad 3 and the interior of the external threaded guide cylinder 6 will form a nearly closed space. When compressed by the load, a compressed air cavity will be formed inside, forming an effect similar to an "air spring", but the damping effect is poor.

[0063] Therefore, a vent 302 and an exhaust port 603 are added, and the diameter of the vents can be set according to the resistance. During the process of air entering and exiting through the vent 302 and exhaust port 603, the energy of the compressed spring 5 can be dissipated, forming a damping effect, which helps to reduce vibration.

[0064] This vibration isolation structure combines a compression spring 5 with a closed-cell polyurethane vibration isolation pad to form a complementary vibration isolation system, which combines the high load and low frequency response capability of the spring with the high damping and energy dissipation characteristics of the polyurethane material.

[0065] Compression spring 5 excels at isolating low-frequency vibrations (such as 2-10 Hz), but it has almost no damping and will amplify vibrations in the resonance region; the honeycomb biomimetic closed-cell polyurethane vibration isolation pad has the ability to absorb energy in the mid-to-high frequency range, which can effectively eliminate the resonance peak of compression spring 5. The combination of the two can achieve a wide-bandwidth vibration isolation effect.

[0066] The compression spring 5 may be severely amplified when passing through the resonant frequency. The closed-cell polyurethane vibration isolation pad 3 can provide structural damping, effectively suppress the peak value of the resonance, and improve the stability of the application system during startup, shutdown, and fluctuation.

[0067] The closed-cell polyurethane vibration isolation pad 3 possesses nonlinear stiffness, and under high load conditions, it is further supported by the compression spring 5, thereby improving its high load capacity. The closed-cell polyurethane vibration isolation pad 3 can reduce the long-term small high-frequency disturbances and fatigue displacements received by the compression spring 5 through its own damping, while the compression spring 5 shares the compressive force under high load conditions with the closed-cell polyurethane vibration isolation pad 3. The combined use of these two components can extend the service life of the vibration isolation structure and improve its stability.

[0068] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A honeycomb biomimetic elastic vibration isolation pad structure, characterized in that, include: The mounting plate consists of an upper mounting plate and a lower mounting plate. The primary vibration reduction mechanism uses a closed-cell polyurethane vibration isolation pad with an internal honeycomb structure. The closed-cell polyurethane vibration isolation pad is installed between the upper mounting plate and the lower mounting plate, and the closed-cell polyurethane vibration isolation pad has multiple vertical through holes. A secondary vibration damping mechanism is installed in each of the vertical through holes. The secondary vibration damping mechanism includes a guide rod and a compression spring coaxially suspended on the upper mounting plate, an external threaded guide cylinder mounted on the lower mounting plate and cooperating with the guide rod, and a limiting nut mounted on the external threaded guide cylinder and spaced apart from the bottom of the compression spring. The limiting nut is connected to the external threaded guide cylinder through an anti-loosening component.

2. The honeycomb biomimetic elastic vibration isolation pad structure according to claim 1, characterized in that, The anti-loosening component is a sleeve with an open top, a hexagonal cavity inside, and a hexagonal inner hole at the bottom. The outer diameter of the hexagonal cavity is larger than the outer diameter of the hexagonal inner hole. The bottom of the external threaded guide cylinder is provided with an outwardly expanding hexagonal base. The hexagonal cavity cooperates with the limiting nut, and the hexagonal inner hole cooperates with the hexagonal base.

3. The honeycomb biomimetic elastic vibration isolation pad structure according to claim 2, characterized in that, The bottom of the anti-loosening component is attached to the lower mounting plate by adhesive.

4. The honeycomb biomimetic elastic vibration isolation pad structure according to claim 1, characterized in that, The external threaded guide cylinder is fixed to the lower mounting plate by a provided lower thread.

5. The honeycomb biomimetic elastic vibration isolation pad structure according to claim 1, characterized in that, The guide rod consists of an upper pad and a middle rod. The top of the pad is fixed to the upper mounting plate by an upper threaded part, and the bottom of the rod has an internal hexagonal hole.

6. The honeycomb biomimetic elastic vibration isolation pad structure according to claim 5, characterized in that, The compression spring is welded and fixed to the lower surface of the pad.

7. The honeycomb biomimetic elastic vibration isolation pad structure according to claim 1, characterized in that, The compression spring is welded to a contact ring at its bottom end, and the contact ring is sleeved on the upper part of the external threaded guide cylinder.

8. The honeycomb biomimetic elastic vibration isolation pad structure according to claim 1, characterized in that, Each of the vertical through holes in the closed-cell polyurethane vibration isolation pad is provided with a vent hole that communicates with the outside.

9. The honeycomb biomimetic elastic vibration isolation pad structure according to claim 1, characterized in that, The bottom of the external threaded guide cylinder has an exhaust hole that communicates with the vertical through hole.

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