Adjustable quasi-zero stiffness vibration isolation device

Abstract

The vibration isolation device comprises a top plate and a bottom plate, a first upper connecting rod and a second upper connecting rod are hinged to the lower side of the top plate through first cylindrical pins, and a first lower connecting rod and a second lower connecting rod are hinged to the upper side of the bottom plate through second cylindrical pins. The first lower connecting rod is hinged to the first upper connecting rod through a third cylindrical pin, the second lower connecting rod is hinged to the second upper connecting rod through a third cylindrical pin, the nonlinear vibration isolation effect of high static rigidity and low dynamic rigidity can be achieved, positive rigidity is provided by the torsion spring, negative rigidity is provided by the spiral spring, and vibration isolation is achieved. The spiral spring obtains pre-tightening force by rotating the force adjusting piece, and vertical adjustment in the platform period is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of structural vibration reduction and isolation, in particular to an adjustable zero-rigidity vibration isolation device. Background Art

[0002] In modern industry and engineering, vibration control is an issue that cannot be ignored. Vibration, especially low-frequency vibration, often has an adverse effect on the stability and life of mechanical equipment. In precision instrument manufacturing, vibration can reduce the processing accuracy and performance of the product. Therefore, effectively controlling and isolating vibration is the key to improving equipment performance and safety.

[0003] Traditional vibration isolation technologies mainly include active control and passive control. Active control technology requires additional energy and complex control systems, while passive control technology, although widely used, has an inherent contradiction between the stiffness and bearing capacity of its linear vibration isolators. This limits their application in the field of low-frequency vibration isolation.

[0004] In order to overcome the limitations of traditional vibration isolation technology, quasi-zero stiffness vibration isolation technology came into being. This technology achieves high static and low dynamic stiffness characteristics through the principle of nonlinear mechanics. The quasi-zero stiffness vibration isolation system has very low stiffness near the static equilibrium position, which can effectively isolate low-frequency vibrations.

[0005] Quasi-zero stiffness vibration isolation structures have a high reliance on precise load matching in terms of vibration isolation effect. However, many current quasi-zero stiffness designs lack the ability to adjust their plateau period when the load changes. When there is a deviation between the actual load and the designed load, these quasi-zero stiffness structures may not be able to provide the expected vibration isolation performance, resulting in their vibration isolation effect being equivalent to that of a linear vibration isolation system, and failing to give full play to their advantages of nonlinear vibration isolation.

[0006] Based on this, the utility model proposes an adjustable zero-stiffness vibration isolation device to solve the above problems. Utility Model Content

[0007] In order to overcome the defects in the above-mentioned prior art, the utility model provides an adjustable zero-stiffness vibration isolation device, which can achieve a nonlinear vibration isolation effect with high static stiffness and low dynamic stiffness, wherein the first torsion spring and the second torsion spring provide positive stiffness, and the coil spring provides negative stiffness, and the coil spring obtains a pre-tightening force through the rotational force adjustment piece to achieve up and down adjustment of the platform period.

[0008] Technical Solution

[0009] An adjustable zero-stiffness vibration isolation device comprises a top plate and a bottom plate, wherein a first upper connecting rod and a second upper connecting rod are hingedly connected on the lower side of the top plate via a first cylindrical pin, a first lower connecting rod and a second lower connecting rod are hingedly connected on the upper side of the bottom plate via a second cylindrical pin, the first lower connecting rod and the first upper connecting rod are hingedly connected via a third cylindrical pin, and the second lower connecting rod and the second upper connecting rod are hingedly connected via the third cylindrical pin.

[0010] Furthermore, a connecting piece is slidably inserted into the middle position of the third cylindrical pin, and a force adjustment piece is penetrated through and threadedly connected to the connecting piece.

[0011] Furthermore, a coil spring is fixedly connected between the two force adjustment members.

[0012] Furthermore, a first torsion spring and a second torsion spring penetrated by the third cylindrical pin are respectively provided on both sides of the connecting member.

[0013] Furthermore, two ends of the first torsion spring are fixedly connected to the upper end of the first lower connecting rod and the lower end of the first upper connecting rod respectively.

[0014] Furthermore, two ends of the second torsion spring are fixedly connected to the upper end of the second lower connecting rod and the lower end of the second upper connecting rod respectively.

[0015] Beneficial Effects

[0016] Compared with the prior art, the utility model has the following beneficial effects: under different loads, the preload force of the coil spring can be adjusted by screwing the force adjusting part in and out, and the platform period can be adjusted, so as to achieve a nonlinear vibration isolation effect with high static stiffness and low dynamic stiffness, wherein the first torsion spring and the second torsion spring provide positive stiffness, and the coil spring provides negative stiffness, and the coil spring obtains a preload force by rotating the force adjusting part, so as to achieve up and down adjustment of the platform period. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an adjustable zero-stiffness vibration isolation device of the utility model;

[0018] Figure 2 It is the force displacement curve diagram before and after the coil spring preload adjustment.

[0019] Reference numerals

[0020] Top plate 1, first cylindrical pin 2, first upper connecting rod 3, second upper connecting rod 4, third cylindrical pin 5, first lower connecting rod 6, second lower connecting rod 7, second cylindrical pin 8, bottom plate 9, coil spring 10, connecting piece 11, force adjusting piece 12, second torsion spring 13, first torsion spring 14. DETAILED DESCRIPTION

[0021] In order to better illustrate the content of the utility model, the following is a description with reference to the accompanying drawings and implementation examples:

[0022] like Figure 1-2 As shown, the utility model discloses an adjustable zero-stiffness vibration isolation device, including a top plate 1 and a bottom plate 9, the lower side of the top plate 1 is hinged with a first upper connecting rod 3 and a second upper connecting rod 4 through a first cylindrical pin 2, the upper side of the bottom plate 9 is hinged with a first lower connecting rod 6 and a second lower connecting rod 7 through a second cylindrical pin 8, the first lower connecting rod 6 and the first upper connecting rod 3 are hinged through a third cylindrical pin 5, and the second lower connecting rod 7 and the second upper connecting rod 4 are hinged through the third cylindrical pin 5.

[0023] Furthermore, a connecting piece 11 is slidably inserted into the middle position of the third cylindrical pin 5 , and a force adjusting piece 12 is penetrated through and threadedly connected to the connecting piece 11 .

[0024] Furthermore, a coil spring 10 is fixedly connected between the two force adjustment members 12 .

[0025] Furthermore, a first torsion spring 14 and a second torsion spring 13 pierced by the third cylindrical pin 5 are respectively provided on both sides of the connecting member 11 .

[0026] Furthermore, two ends of the first torsion spring 14 are fixedly connected to the upper end of the first lower connecting rod 6 and the lower end of the first upper connecting rod 3 , respectively.

[0027] Furthermore, two ends of the second torsion spring 13 are fixedly connected to the upper end of the second lower connecting rod 7 and the lower end of the second upper connecting rod 4 respectively.

[0028] Specifically, a nonlinear vibration isolation effect with high static stiffness and low dynamic stiffness can be achieved, wherein the first torsion spring 14 and the second torsion spring 13 provide positive stiffness, and the coil spring 10 provides negative stiffness. The coil spring 10 obtains a preload through the rotation force adjustment member to achieve up and down adjustment of the platform period.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the technical solution of the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solution recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solution from the spirit and scope of the technical solution of each embodiment of the utility model.

Claims

1. An adjustable zero-stiffness vibration isolation device, characterized in that: The invention comprises a top plate (1) and a bottom plate (9); a first upper connecting rod (3) and a second upper connecting rod (4) are hingedly connected on the lower side of the top plate (1) through a first cylindrical pin (2); a first lower connecting rod (6) and a second lower connecting rod (7) are hingedly connected on the upper side of the bottom plate (9) through a second cylindrical pin (8); the first lower connecting rod (6) and the first upper connecting rod (3) are hingedly connected through a third cylindrical pin (5); the second lower connecting rod (7) and the second upper connecting rod (4) are hingedly connected through the third cylindrical pin (5); a connecting piece (11) is slidably inserted into the middle position of the third cylindrical pin (5); a force adjusting piece (12) is penetrated through and threadedly connected to the connecting piece (11); a spiral spring (10) is fixedly connected between the two force adjusting pieces (12); and a first torsion spring (14) and a second torsion spring (13) penetrated through the third cylindrical pin (5) are respectively arranged on both sides of the connecting piece (11).

2. The adjustable zero-stiffness vibration isolation device according to claim 1, characterized in that: The two ends of the first torsion spring (14) are respectively fixedly connected to the upper end of the first lower connecting rod (6) and the lower end of the first upper connecting rod (3).

3. The adjustable zero-stiffness vibration isolation device according to claim 2, characterized in that: The two ends of the second torsion spring (13) are respectively fixedly connected to the upper end of the second lower connecting rod (7) and the lower end of the second upper connecting rod (4).

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