A vibration reduction and noise reduction device for a centrifuge used in geotechnical experiments

Abstract

This invention designs a vibration reduction and noise reduction device for a centrifuge used in geotechnical experiments. The device can be attached to the bottom of the centrifuge to reduce vibration and noise. The device includes adhesive tape, a vibration-damping pad, and feet. The vibration-damping pad is internally wrapped with a vibration-damping plate, on which scattering elements made of tungsten cylinders and silicone rubber rings are periodically arranged. The vibration-damping pad is adhered to the bottom of the centrifuge with double-sided adhesive tape. Holes are drilled at corresponding positions on the feet, and the bottom of the centrifuge is connected to the rubber feet wrapped with screw rods through internal threaded holes. Centrifuges generate strong vibrations and high noise during operation, and traditional vibration reduction devices are mainly effective at high frequencies. This invention utilizes the phonon crystal noise reduction principle to absorb low-frequency vibration noise, achieving vibration and noise reduction across the entire frequency range. This invention has a simple structure, is easy to install and use, and is economical.

Description

Technical Field

[0001] This utility model relates to the field of geotechnical testing, and in particular to a vibration reduction and noise reduction device for a centrifuge used in geotechnical testing. Background Technology

[0002] Centrifuges, as commonly used equipment in geotechnical experiments and testing, play a vital role in concrete and asphalt testing, soil particle analysis, and soil-rock sample separation. However, their high rotational speed inevitably generates vibration and noise, primarily at low to mid-frequency, making the noise particularly dull and difficult to reduce. This not only affects the centrifuge's performance and lifespan but also poses a risk to the physical and mental health of users. Therefore, vibration and noise reduction for geotechnical experimental centrifuges is of great significance.

[0003] Traditional vibration reduction and noise reduction methods for centrifuges are divided into active and passive noise reduction. Active vibration reduction involves designing the centrifuge to operate at speeds well away from the critical speed of the rotating system. Passive vibration reduction uses various types of vibration dampers to isolate potential vibrations from the frame and foundation. Active vibration reduction technology is effective at low frequencies, but it requires an external power source, has a complex control system, and suffers from poor reliability. Traditional vibration dampers are effective at high frequencies but struggle to effectively suppress low-frequency vibrations. Therefore, both of these methods have limited vibration reduction effects and high costs associated with upgrading. Utility Model Content

[0004] In order to overcome the shortcomings of existing vibration reduction and noise reduction technologies, this utility model provides a more effective vibration reduction and noise reduction device.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a vibration reduction and noise reduction device for a centrifuge used in geotechnical experiments, comprising adhesive tape, vibration damping pads, and feet.

[0006] The bottom of the centrifuge is attached to the vibration damping pad using adhesive tape.

[0007] Furthermore, the base material of the vibration damping pad is nitrile rubber, and it is wrapped with a vibration damping plate inside;

[0008] Furthermore, the substrate of the damping plate is epoxy resin, and its periodically arranged scattering body is composed of tungsten metal cylinders and silicone rubber rings;

[0009] Furthermore, in the scatterer, the diameter of the tungsten metal cylinder is 5-8 mm, the outer diameter of the silicone rubber ring is 6-9 mm, and the spacing between the scatterers is 10-15 mm;

[0010] The rubber feet are connected to the bottom of the centrifuge by screws, and the vibration damping pads have through holes at the corresponding positions of the rubber feet.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. By installing phonon crystal vibration damping pads and four corner rubber vibration dampers that are in direct contact with the centrifuge body, the centrifuge body is supported while effectively reducing vibration and noise. Specifically: During acceleration and deceleration, the centrifuge mainly generates low-frequency noise, which is absorbed by the specially designed phonon crystal vibration damping pads through local resonance. After the speed stabilizes, high-frequency vibration is generated, at which point the rubber feet play a major role in vibration damping, thus achieving vibration and noise reduction across the entire frequency range.

[0013] 2. For different models of centrifuges with variations in power and speed, the low-frequency noise range can be adapted by adjusting the cell size and structure of the phonon crystal inside the vibration damping pad. Furthermore, this vibration damping and noise reduction device is easy to install and is applicable to most flat-bottomed centrifuges on the market, demonstrating broad application prospects. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a partial cross-sectional view of the shock-absorbing pad of this utility model.

[0016] Figure 3 This is a partial front view of the vibration damping plate of this utility model.

[0017] Attached Figure

[0018] 1. Adhesive tape; 2. Vibration damping pad; 3. Rubber feet; 4. Vibration damping plate; 5. Tungsten metal cylinder; 6. Silicone rubber ring. Detailed Implementation

[0019] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments. However, the following embodiments are only preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this utility model. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials used in the following embodiments are commercially available unless otherwise specified.

[0020] As attached Figure 1 To be continued Figure 2As shown: This utility model provides a vibration reduction and noise reduction device for a geotechnical experimental centrifuge, including adhesive tape, vibration damping pads, and feet. The bottom of the centrifuge body is bonded to the vibration damping pads 2 via adhesive tape 1, ensuring full contact between the pads and the centrifuge body and effectively transmitting the vibration noise generated by the centrifuge body to the pads. The vibration damping pads 2 enclose a vibration damping plate 4, which is made of epoxy resin and contains an array of scattering elements composed of tungsten metal cylinders 5 and silicone rubber rings 6. In this embodiment, the tungsten metal cylinders 5 have a diameter of 6mm, the silicone rubber rings 6 have an outer diameter of 7mm, and the entire vibration damping plate is 1.5mm thick. Rubber feet 3 are fixedly connected to the bottom of the centrifuge body. The feet 3 help to fix the position of the centrifuge body, preventing abnormal movement during operation and damping high-frequency vibrations.

[0021] Working Principle: Conventional centrifuges typically operate at speeds between 5000 and 100000 rpm. During operation, the core energy is concentrated in the fundamental frequency and its lower harmonics (80Hz-500Hz), which are directly related to the rotational speed. The specially designed phononic crystal material contains an elastic wave bandgap. Elastic waves falling within this bandgap experience strong attenuation when propagating within the phononic crystal. The high-speed rotation of the centrifuge generates low-to-medium frequency vibrations, which are transmitted to the phononic crystal damping plate through the damping pad 2. When the vibration frequency approaches or equals the natural frequency of the tungsten metal scatterer 5 in the array, local resonance occurs. The elastic waves are absorbed and weakened by the bandgap, thus achieving vibration reduction and noise reduction for the centrifuge.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] 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. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. 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 the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents. Of course, the foregoing description is not a limitation of this utility model, and this utility model is not limited to the examples given above. Changes, modifications, additions, or substitutions made by those skilled in the art within the scope of this utility model should also fall within the protection scope of this utility model.

Claims

1. A vibration and noise reduction device for a geotechnical centrifuge, characterized by: Includes adhesive tape (1), vibration damping pads (2), and rubber feet (3); The bottom of the centrifuge is bonded to the vibration damping pad (2) by adhesive tape (1); The damping pad (2) is wrapped with a damping plate (4), which is a scattering body composed of tungsten metal cylinders (5) and silicone rubber rings (6) arranged periodically. The rubber feet (3) are connected to the bottom of the centrifuge by screws, and the vibration damping pads (2) have through holes at the corresponding positions of the feet.

2. The apparatus according to claim 1, characterized in that: The vibration damping pad (2) is composed of a nitrile rubber substrate wrapped with a vibration damping plate (4).

3. The apparatus according to claim 1, characterized in that: The base of the damping plate (4) is epoxy resin, and its periodically arranged scattering body is composed of tungsten metal cylinders (5) and silicone rubber rings (6).

4. The apparatus according to claim 3, characterized in that: In the periodically arranged scatterers, the tungsten metal cylinder (5) has a diameter of 5-8 mm, the silicone rubber ring (6) has an outer diameter of 6-9 mm, and the spacing between the scatterers is 10-15 mm.

Images