A vibration isolation and vibration reduction bearing based on memory alloy

Abstract

The present invention discloses a vibration isolation and vibration reduction support based on memory alloy, comprising a leaf spring group, an upper panel and a lower panel, wherein the leaf spring group is made of memory metal; when working, when the upper panel or the lower panel is under the vibration load, the relative vertical spacing between them will change, on the one hand, the memory alloy leaf spring group is compressed and deformed to absorb energy or recover to its original state to release energy, thus achieving the purpose of vibration isolation and vibration reduction by relying on the unique structure and material characteristics of the memory alloy leaf spring group, on the other hand, the memory alloy rope is also stretched or retracted with the alternating deformation of the memory alloy leaf spring group, and the structure and material function of the memory alloy rope provide greater hysteresis energy consumption and restoring force. The present invention can effectively resist vertical vibration, has good damping effect, strong energy consumption capacity, has extremely high reliability and stability when working for a long time, and can automatically recover after re-vibration without the need for additional reset device.

Description

Technical Field

[0001] The invention relates to the technical field of vibration reduction in mechanical engineering and civil engineering, in particular to a vibration isolation and vibration reduction support based on memory alloy. Background Art

[0002] Vibration isolation and vibration reduction bearings are devices installed between the upper and lower structures or between the upper structure and the base. This device is mainly used to dissipate, isolate or delay vibration energy by increasing the flexibility of the structure, extending the natural vibration period of the structure, and increasing the damping of the structure, so as to reduce the vibration response of the structure, protect the structure, and avoid the occurrence of vibration damage.

[0003] The vibration isolation and vibration reduction bearings in the prior art are mainly divided into three categories: rubber pad bearings, sliding friction bearings and friction swing bearings; among them, the rubber pad bearings have certain vibration isolation and vibration reduction performance in the horizontal direction, but because their damping is very small and they do not have sufficient energy dissipation capacity, they are powerless against vertical vibrations caused by earthquakes, rail transit or stamping machines, and are generally used in conjunction with other dampers or energy-consuming equipment in structural use; in addition, rubber materials also have problems of aging, corrosion and environmental pollution during use; sliding friction bearings and friction swing bearings effectively limit the transmission and feedback of vibration energy through relative sliding motion and friction energy dissipation. This method has reliable force, low construction difficulty, and no need to consider the rust prevention and damage replacement of steel parts. Its biggest drawback is that an additional reset mechanism device needs to be configured, otherwise the structure cannot be reset after vibration. In addition, sliding friction bearings and friction swing bearings also have the defects of poor vertical vibration resistance and poor stability performance. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide a vibration isolation and vibration reduction bearing based on memory alloy, which can effectively resist vertical vibration when performing vibration isolation and vibration reduction work, has good damping effect, strong energy consumption capacity, and has extremely high reliability and stability when working for a long time. It can also automatically recover after re-vibration without the need for additional reset device.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a vibration isolation and vibration reduction support based on memory alloy, comprising a leaf spring group, an upper panel and a lower panel;

[0006] The leaf spring group is composed of at least one cross-shaped leaf spring stacked together, each leaf spring has four spring arms, and the ends of the four spring arms of the uppermost leaf spring are provided with two lugs and two rolled ears in sequence; the rolled ears are curled bent plates; the leaf spring is made of memory alloy; a threaded through hole is opened in the middle of each leaf spring;

[0007] The lower panel is a circular steel plate, with a spherical groove in the middle thereof, the radius of curvature of the groove being equal to the radius of curvature of the lower edge of the lowest leaf spring; the lowest leaf spring is fixedly connected to the groove by friction;

[0008] A threaded through hole matching the leaf spring is opened in the middle of the lower panel, which is fixedly connected to the leaf spring assembly by bolts; the leaf spring assembly is also provided with at least one spring clamp for fixing the spring arm of the leaf spring;

[0009] The main body of the upper panel is a circular steel plate, and a semicircular boss is provided on the lower edge thereof; two notches matching with the rolled ears are provided on the side of the upper panel away from the boss, and two opposite rolled ear links are provided at the end of each notch; the rolled ear links are hinged to the rolled ears through bolts; the boss matches with the lug and is pressed onto the lug; the leaf spring group is composed of no less than one leaf spring stacked from small to large.

[0010] Furthermore, a rope through hole is respectively opened at the proximal end of each of the four spring arms of the uppermost leaf spring, and every two opposite spring arms are tightened and reinforced with the memory alloy rope through the rope through hole.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] 1. The present invention uses a memory alloy leaf spring and a memory alloy rope, which not only utilizes the good superelastic effect and high damping characteristics of the memory alloy material, but also utilizes the characteristics of its structure. The two are effectively combined to extremely well suppress the response of the support under vibration, greatly improve the self-resetting ability of the support and the effect of vibration isolation and vibration reduction, and improve the service life and reliability of the structure. In particular, the memory alloy rope can simultaneously play the dual effects of a damper and a reset mechanism device, reducing the maintenance cost of the structure.

[0013] 2. The present invention is composed of components with simple structural forms. During operation, the stiffness of the leaf spring can be changed by adjusting the shape, size or quantity of the leaf spring, thereby controlling the vibration frequency of the structure. The damping coefficient of the structure can also be adjusted by changing the shape, size or quantity of the leaf spring and the rope, thereby changing the damping ratio of the entire system, thereby improving the convenience of using the support.

[0014] 3. The materials used for the leaf spring and rope of the present invention have good corrosion resistance and plasticity, high strength and fatigue resistance, which improves the durability of the support and the stability of parameters and reduces the impact of the environment.

[0015] 4. The present invention replaces the vibration isolation and vibration reduction components made of ordinary materials with leaf springs and ropes made of memory alloy materials, which significantly expands the application range of the support, making this type of support not only suitable for the vibration isolation and vibration reduction requirements in large structures, but also suitable for the vibration isolation and vibration reduction needs in small structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional cross-sectional structural schematic diagram of the present invention;

[0017] Figure 2 for Figure 1 Sectional view in the AA direction;

[0018] Figure 3 It is a schematic diagram of the three-dimensional structure of the upper panel of the present invention from a bottom viewing angle;

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the top leaf spring of the present invention;

[0020] Figure 5 It is a three-dimensional structural schematic diagram of the lower leaf spring of the present invention;

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of the lower panel of the present invention;

[0022] Figure 7 is a curve between stress and strain of the memory alloy rope of the present invention;

[0023] Figure 8 is the recovery stress and recovery rate curve of the memory alloy rope of the present invention;

[0024] Fig. 9 It is a comparison curve of the vibration displacement response spectra of the upper panel and the lower panel of the support of the present invention.

[0025] In the figure: 1, leaf spring assembly, 2, lug, 3, coiled lug, 4, memory alloy rope, 5, upper panel, 6, notch, 7, coiled lug link, 8, boss, 9, bolt, 10, spring clamp, 11, lower panel, 12, groove, 13, leaf spring. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] like Figures 1 to 6 As shown, a vibration isolation and vibration reduction support based on memory alloy includes a leaf spring group 1, an upper panel 5 and a lower panel 11;

[0028] The leaf spring assembly 1 is composed of at least one cross-shaped leaf spring 13 stacked together, each leaf spring 13 has four spring arms, and the ends of the four spring arms of the top leaf spring 13 are provided with two lugs 2 and two rolled ears 3 in sequence; the rolled ears 3 are curled bent plates; the leaf spring 13 is made of memory alloy; a threaded through hole is opened in the middle of each leaf spring 13;

[0029] The lower panel 11 is a circular steel plate, and a spherical groove 12 is provided in the middle thereof, and the curvature radius of the groove 12 is equal to the curvature radius of the lower edge of the lowest leaf spring 13; the lowest leaf spring 13 is fixedly connected to the groove 12 by friction; a threaded through hole matching the leaf spring 13 is provided in the middle of the lower panel 11, and is fixedly connected to the leaf spring group 1 by a bolt 9; the leaf spring group 1 is also provided with at least one spring clamp 10 for fixing the spring arms of several leaf springs 13;

[0030] The main body of the upper panel 5 is a circular steel plate, and a semicircular boss 8 is provided on the lower edge thereof; two notches 6 matching with the rolled ears 3 are provided on the side of the upper panel 5 away from the boss 8, and two opposite rolled ear links 7 are provided at the end of each notch 6; the rolled ear link 7 is hinged to the rolled ear 3 by a bolt 9; the boss 8 matches with the lug 2 and is pressed onto the lug 2.

[0031] A rope through hole is respectively formed near the end of the four spring arms of the uppermost leaf spring 13 , and every two opposing spring arms are tightened and reinforced with the memory alloy rope 4 through the rope through hole.

[0032] The leaf spring assembly 1 is formed by stacking at least one leaf spring 13 from small to large, and the spring arm of the smaller leaf spring 13 is shorter than the spring arm of the longer leaf spring 13 .

[0033] During operation, when the upper panel 5 or the lower panel 11 is under the action of vibration load, the relative vertical spacing between them will change. On the one hand, the memory alloy leaf spring group 1 is compressed and deformed to absorb energy or restored to its original state to release energy. In this way, the purpose of vibration isolation and vibration reduction is achieved by relying on the unique structure and material characteristics of the memory alloy leaf spring group 1. On the other hand, the memory alloy rope 4 is also stretched or retracted with the alternating deformation of the memory alloy leaf spring group 1. Relying on the structure and material function of the memory alloy rope 4, a larger hysteresis energy dissipation and restoring force are provided.

[0034] The memory alloy vibration isolation and vibration reduction bearing manufactured above was tested, and the experimental data obtained are as follows Figures 7 to 9 shown. Figure 7 The relationship curve between stress and strain of the memory alloy rope 4 of the support of the present invention under loading and unloading is given. Figure 7It can be seen that due to the influence of the loading and unloading cyclic load, the stress-strain curve of the memory alloy rope 4 presents a typical hysteresis closed curve, that is, an energy dissipation hysteresis loop. The larger the hysteresis loop, the better the energy dissipation effect. However, the curve does not show an obvious stress platform or a large energy dissipation hysteresis loop during the loading / unloading process. The reason is that only a small part of the alloy material in the rope undergoes a martensitic phase transformation, while most of the material is still in a state of elastic deformation. Despite this, the memory alloy rope 4 clearly shows good energy dissipation characteristics, has an excellent energy dissipation hysteresis loop and high recovery ability, and the energy dissipation hysteresis loop increases with the increase of external load (such as Figure 7 As shown, the external load of curve 2 is greater than that of curve 1). Figure 8 is the recovery force and recovery rate curve of the memory alloy rope 4 stretching and retraction experiment, Figure 8 It can be seen that the restoring force of the memory alloy rope 4 can reach more than 590Mpa after an appropriate amount of stretching. When the strain of the memory alloy rope 4 reaches about 10%, a restoring force of up to 690Mpa can be generated (such as Figure 8 Curve 4); In addition, the maximum fully recoverable strain of the memory alloy rope 4 is up to 10%. When the strain is lower than this value and the rope is unloaded, the strain generated by the rope can be fully recovered, that is, the recovery rate is 100%. When the strain is higher than this value and the rope is unloaded, the strain generated by the rope cannot be fully recovered (such as Figure 8 Curve 3); It can be seen that the support of the present invention has a strong self-resetting ability. Fig. 9 A comparison curve of the vibration displacement response spectrum of the upper panel 5 and the lower panel 11 of the support of the present invention is given. After the excitation load is applied to the lower panel 11, the displacement response of the upper panel 5 at different frequencies is about 1 / 4 of that of the lower panel 11, that is, the frequency displacement response of the upper panel 5 structure is greatly reduced, which shows that the vibration resistance of the upper panel 5 is greatly improved and enhanced than that of the structure of the lower panel 11. In summary, the support of the present invention has a strong self-reset ability and outstanding vibration isolation and vibration reduction effect.

[0035] As can be seen from the above, the support of the present invention absorbs the advantages of the new shape memory alloy material on the basis of the traditional support, replaces the original ordinary material support with the shape memory alloy material, and takes advantage of the advantages of the shape memory alloy itself, namely, high damping, large restoring force and deformation, high corrosion resistance, high strength, good plasticity and other characteristics, and also has the advantages of long fatigue life and small impact of environmental factors, thereby greatly reducing the limitations of the support in application, so the vibration isolation and vibration reduction of the support does not need to rely on rubber pads or friction to provide, but simply through the shape memory alloy component to achieve the purpose. At the same time, the vibration isolation and vibration reduction control of the support is converted into the processing of the shape, size or quantity of the memory alloy component, so that for on-site construction, its construction process and equipment are simple, easy to operate, and the effect is safe and reliable. It can be seen that the vibration isolation and vibration reduction support of the shape memory alloy not only improves the self-restoring force, vibration isolation and vibration reduction, stability, safety, durability and scope of application of the structure, but also has the advantages of simple process, reliability, low investment and cost.

[0036] Those skilled in the art should understand the main idea of ​​the present invention. Although the present invention is described for one or a group of cross-shaped memory alloy leaf springs 1, the scope of application of the present invention is not limited thereto. Figure 4 The memory alloy leaf spring group 1 is designed in other forms such as hexagonal star, octagonal star, I-shaped, etc., and can be expanded into a sliding friction support, and can also be designed into a petal-shaped structure. Of course, the memory alloy leaf spring group 1 can also be replaced by a leaf spring group 1 of other materials, etc. Figure 4 and Figure 5 The specific description is only for clarifying the idea of ​​the present invention. The technical personnel in the field should understand its essence. As long as the idea of ​​vibration isolation and vibration reduction design of the leaf spring group 1 is utilized, it is within the protection scope of the present invention.

Claims

1. A vibration isolation and vibration reduction support based on memory alloy, characterized in that: The invention comprises a leaf spring group (1), an upper panel (5) and a lower panel (11); the leaf spring group (1) is composed of at least one cross-shaped leaf spring (13) superimposed on each other, each leaf spring (13) having four spring arms, and the ends of the four spring arms of the uppermost leaf spring (13) are provided with two lugs (2) and two curling ears (3) in sequence; the curling ears (3) are curled bent plates; the leaf spring (13) is made of memory alloy; a threaded through hole is provided in the middle of each leaf spring (13); the lower panel (11) is a circular steel plate, a spherical groove (12) is provided in the middle thereof, and the curvature radius of the groove (12) is equal to the curvature radius of the lower edge of the lowermost leaf spring (13); the lowermost leaf spring (13) is fixedly connected to the groove (12) by friction; the lower panel (11) 1) is provided with a threaded through hole matched with the leaf spring (13) in the middle thereof, and is fixedly connected with the leaf spring group (1) by means of a bolt (9); the leaf spring group (1) is also provided with at least one spring clamp (10) for fixing the spring arm of the leaf spring (13); the main body of the upper panel (5) is a circular steel plate, and a semicircular boss (8) is provided on the lower edge thereof; two notches (6) matched with the rolled ears (3) are provided on the side of the upper panel (5) away from the boss (8), and two opposite rolled ear links (7) are provided at the end of each notch (6); the rolled ear link (7) is hinged with the rolled ears (3) by means of a bolt (9); the boss (8) matches with the lug (2) and is pressed onto the lug (2); the leaf spring group (1) is formed by stacking at least one leaf spring (13) from small to large.

2. The vibration isolation and vibration reduction support based on memory alloy according to claim 1, characterized in that: A rope through hole is respectively opened near the end of the four spring arms of the uppermost leaf spring (13), and every two opposing spring arms are tightened and reinforced with the memory alloy rope (4) through the rope through hole.

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