A torsion bar spring quasi-zero stiffness vibration isolator

Abstract

The present invention discloses a torsion bar spring quasi-zero stiffness vibration isolator to improve the load-bearing capacity of the quasi-zero stiffness vibration isolator. The mechanism of the present invention includes a torsion bar support platform assembly, a horizontal spring, a horizontal slider, a horizontal guide rail, a rotating pin, a vertical guide assembly, a vertical damper and a base. The torsion bar support platform assembly is connected to the horizontal slider through a rotating pin. The horizontal slider slides horizontally on the slide rail and squeezes the horizontal spring sleeved on the horizontal slide rail; at the same time, the torsion bar support platform assembly is constrained to move up and down in the vertical direction through two sets of vertical guide assemblies. The vertical damper is installed between the torsion bar support platform assembly and the base. When the present invention is working, the precision equipment is placed above the torsion bar support platform to isolate the vibration input from the base. The present invention connects the positive stiffness provided by the torsion bar spring and the negative stiffness provided by the horizontal spring in parallel to form a quasi-zero stiffness, which can achieve a larger load-bearing capacity and ultra-low frequency vibration isolation effect.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration and noise control, and in particular to a torsion bar spring quasi-zero stiffness vibration isolator. Background Art

[0002] Vibration and shock are common in daily life and production, and most of these vibrations negatively impact equipment performance and human comfort. Therefore, effective isolation of these vibrations is essential. Simultaneously, requirements for vibration environments, product characteristics, and structural vibration characteristics are increasing, requiring low-frequency / ultra-low-frequency vibration isolation to achieve significant attenuation at higher frequencies. In daily life, people are most sensitive to low-frequency vibrations, and prolonged exposure to low-frequency vibration can cause adverse reactions such as fatigue and anxiety. Therefore, low-frequency vibration isolation is essential for protecting precision equipment and improving human comfort.

[0003] However, for general linear vibration isolators, only when the excitation frequency is greater than the natural frequency of the linear system Vibration attenuation can only be achieved when the stiffness of the linear system is reduced to achieve low-frequency vibration isolation. Therefore, if the stiffness of the linear system is reduced to achieve low-frequency vibration isolation, the problem of large static displacement of the load equipment will be encountered. In this context, quasi-zero stiffness vibration isolators with high static and low dynamic stiffness are widely used. Current quasi-zero stiffness vibration isolators are mostly composed of three sets of linear coil springs in parallel, which have limited load-bearing capacity and cannot meet the low-frequency vibration isolation requirements of heavy and precision equipment. If the load-bearing capacity is increased by measures such as increasing the diameter of the coil spring, the volume of the system will increase significantly, which is not conducive to practical application. Summary of the Invention

[0004] The present invention aims to address the defects of the prior art and provide a torsion bar spring quasi-zero stiffness vibration isolator to improve the bearing capacity of the quasi-zero stiffness and achieve low-frequency vibration isolation of heavy and precision equipment.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A torsion bar spring quasi-zero stiffness vibration isolator, characterized in that it includes a torsion bar support platform assembly, a base, a horizontal slider, a horizontal spring, and a horizontal guide rail. The torsion bar support platform assembly includes a support platform, a torsion bar spring, and a torsion arm. One end of the torsion bar spring is fixedly connected to the support platform, and the other end is fixedly connected to the torsion arm. The horizontal guide rail is horizontally arranged on the base. The horizontal spring and the horizontal slider are passed through the horizontal guide rail. The torsion arm is rotatably connected to the horizontal slider. When the support platform is displaced in the vertical direction, one end of the torsion arm drives the torsion bar spring to twist, and the other end drives the horizontal slider to move on the horizontal guide rail and compress the horizontal spring.

[0007] Furthermore, the torsion bar spring is horizontally inserted into the support platform, one end of the torsion bar spring is fixedly connected to one side of the support platform through a spline, and the other end passes through the support platform and is fixedly connected to the torsion arm.

[0008] Furthermore, the torsion arm is connected to the side wall of the support platform through a bearing.

[0009] Furthermore, the horizontal slider is connected to the torsion arm via a rotating pin, and the torsion arm can rotate around the rotating pin as an axis.

[0010] Furthermore, a vertical damper is included, which is connected between the base and the support platform.

[0011] Furthermore, it also includes a vertical guide assembly, which includes a vertical slider and a vertical guide rail. The vertical slider is fixed on the support platform, and the vertical guide rail is fixed on the base. The vertical slider and the vertical guide rail are slidably connected.

[0012] Furthermore, the vertical guide components are provided in two groups and are arranged in centrally symmetrical positions.

[0013] Furthermore, the swing range of the angle between the torsion arm and the horizontal guide rail is -45° to 45°.

[0014] Furthermore, the horizontal spring, horizontal guide rail, horizontal slider, torsion bar spring, and torsion arm are provided in two groups and are symmetrically distributed around the center of the support platform.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Utilizing the positive stiffness of the torsion bar and the negative stiffness of the horizontal spring to create a quasi-zero stiffness, low-frequency vibration isolation is achieved for the device. Compared to coil springs, torsion bar springs have a higher energy density and can easily achieve a higher load capacity within a limited space. Therefore, the quasi-zero stiffness vibration isolator described in this invention has a significant load capacity.

[0017] 2. Under the set load capacity, the effective quasi-zero stiffness range of the present invention can be conveniently adjusted by the length of the torsion arm to adapt to low-frequency vibration control within different excitation amplitude ranges.

[0018] 3. The present invention can adjust the load-bearing capacity of the vibration isolator simply by modifying the torsion bar diameter and the torsion arm length, and is suitable for precision equipment of different weights. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention;

[0020] Figure 2 This is a front view of an embodiment of the present invention;

[0021] Figure 3 A top view of an embodiment of the present invention;

[0022] Figure 4 This is a schematic structural diagram of a torsion bar support platform assembly according to an embodiment of the present invention;

[0023] Figure 5 A cross-sectional view of a torsion bar support platform assembly according to an embodiment of the present invention;

[0024] Figure 6 is a diagram showing the relationship between vertical load and vertical displacement according to an embodiment of the present invention;

[0025] Figure 7 Graph showing the load-bearing mass of an embodiment of the present invention under different torsion bar spring diameters and torsion arm lengths.

[0026] Among them: 1-torsion bar spring, 2-support platform, 3-torsion arm, 4-bearing, 5-rotation pin, 6-horizontal slider, 7-horizontal spring, 8-horizontal guide rail, 9-vertical slider, 10-vertical guide rail, 11-vertical damper, 12-base. DETAILED DESCRIPTION

[0027] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0028] Figure 1-5 A specific embodiment of a torsion bar spring quasi-zero stiffness vibration isolator is shown. Figure 1 As shown, this embodiment includes a torsion bar support assembly, a horizontal spring 7, a horizontal guide rail 8, a horizontal slider 6, a rotation pin 5, a vertical guide assembly, a vertical damper 11, and a base 12. The horizontal slider 6 slides through the horizontal guide rail 8, and the horizontal spring 7 is also inserted into the horizontal guide rail 8. The two ends of the horizontal spring 7 respectively abut between the base 12 and the horizontal slider 6. As the horizontal slider 6 slides, it can compress the horizontal spring 7. The horizontal guide rail 8 is horizontally mounted on the base 12.

[0029] like Figure 4 As shown, the torsion bar support platform assembly includes a torsion bar spring 1, a support platform 2, a torsion arm 3, and a bearing 4. One end of the torsion bar spring 1 is fixedly connected to the support platform 2 via a spline, ensuring more uniform torque distribution. The other end passes through the side wall of the support platform 2 and is fixedly connected to the torsion arm 3. The torsion arm 3 is connected to the side wall of the support platform 2 via a bearing 4. The torsion arm 3 is connected to the horizontal slider 6 via a rotating pin 5, allowing the torsion arm 3 to rotate around the rotating pin 5.

[0030] like Figure 2As shown, the vertical guide assembly includes a vertical slider 9 and a vertical guide rail 10. The vertical slider 9 is fixedly connected to the support platform, and the vertical guide rail 10 is vertically mounted on the base 12. The vertical slider 9 and the vertical guide rail 10 are slidably connected, and the vertical slider 9 can move up and down along the vertical guide rail 10, thereby restraining the torsion bar support platform assembly from moving up and down in the vertical direction. A vertical damper 11 is installed between the support platform 2 and the base 12 to provide damping force when the system is in operation.

[0031] like Figure 5 As shown, the torsion bar spring 1, torsion arm 3 and bearing 4 of the torsion bar support platform assembly are each provided with two groups, and are distributed and installed in a centrally symmetrical manner with the center point of the support platform 2 as the center.

[0032] like Figure 3 As shown, the horizontal spring 7, the horizontal guide rail 8, the horizontal slider 6, the rotating pin 5 and the vertical guide assembly are also provided in two groups, and are distributed in a centrally symmetrical manner with the center point of the support platform 2 as the center.

[0033] When the vibration isolator of this embodiment is working, the equipment that needs vibration isolation is placed on the support platform 2 to isolate the low-frequency vibration from the base 12. Figure 2 As shown, in the initial state, the initial angle between the torsion arm 3 and the horizontal guide rail 8 is θ0. After the vibration isolation device is placed on the support platform 2, under the action of gravity, the torsion bar spring quasi-zero stiffness vibration isolator reaches a balanced state. That is, when the angle between the torsion arm 3 and the horizontal guide rail 8 is zero, the system achieves quasi-zero stiffness, which can achieve the best low-frequency vibration isolation effect, isolating low-frequency vibrations from the base 12.

[0034] Without the vertical damper 11, the vibration isolation effect will be poor. In this embodiment, the installed vertical damper 11 plays an energy dissipation role. Due to the nonlinear stiffness characteristics of the vibration isolator itself, the setting of the vertical damper 11 can effectively reduce the peak value of the vibration isolator at resonance and avoid the jumping phenomenon.

[0035] During operation, the angle between the torsion arm 3 and the horizontal guide rail 8 swings in the range of -45° to 45°; when the axis of the torsion bar 1 is above the horizontal guide rail 8, the angle is defined as positive, and vice versa. The relationship curve between the vertical load and vertical displacement of the system is shown in Figure 6 It can be seen that the quasi-zero stiffness of the vibration isolator is formed by the stiffness of the torsion bar spring 1 and the negative stiffness formed by the horizontal spring 7 in parallel, which has a large quasi-zero stiffness range and load-bearing capacity.

[0036] The mass that the torsion bar spring quasi-zero stiffness isolator can bear is:

[0037]

[0038] Where K tis the stiffness of the torsion bar spring 1, g is the acceleration due to gravity, and a is the length of the torsion arm 3.

[0039] For a torsion bar spring, its stiffness K t The expression is:

[0040]

[0041] Wherein, G is the shear modulus of the material of the torsion bar spring 1, d is the diameter of the torsion bar spring 1, and L is the effective length of the torsion bar spring 1.

[0042] Figure 7 This paper demonstrates the dependence of the load-bearing capacity of a torsion bar spring quasi-zero-stiffness vibration isolator on the diameter d of the torsion bar spring 1 and the length a of the torsion arm 3. It can be seen that by adjusting the diameter of the torsion bar spring 1 and the length of the torsion arm 3, any load-bearing capacity can be easily achieved. In particular, increasing the diameter of the torsion bar spring 1 can significantly increase the load-bearing capacity of the vibration isolator, achieving low-frequency vibration isolation for heavy precision equipment.

[0043] The above specific implementation methods are only for illustrating the technical concept and structural features of the present invention, and the purpose is to enable relevant persons familiar with this technology to implement them accordingly. However, the above content does not limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should fall within the scope of protection of the present invention.

Claims

1. A torsion bar spring quasi-zero stiffness vibration isolator, characterized by: The invention comprises a torsion bar support platform assembly, a base (12), a horizontal slider (6), a horizontal spring (7), and a horizontal guide rail (8), wherein the torsion bar support platform assembly comprises a support platform (2), a torsion bar spring (1), and a torsion arm (3), wherein one end of the torsion bar spring (1) is fixedly connected to the support platform (2), and the other end is fixedly connected to the torsion arm (3), and the horizontal guide rail (8) is horizontally arranged on the base (12), and the horizontal spring (7) and the horizontal slider (6) are passed through the horizontal guide rail (8), and the torsion arm (3) is rotatably connected to the horizontal slider (6). When the support platform (2) is displaced in the vertical direction, one end of the torsion arm (3) drives the torsion bar spring (1) to twist, and the other end drives the horizontal slider (6) to move on the horizontal guide rail (8) and compress the horizontal spring (7). When the angle between the torsion arm 3 and the horizontal guide rail (8) is zero, the system achieves quasi-zero stiffness, and at this time, the best low-frequency vibration isolation effect can be achieved, isolating the low-frequency vibration from the base (12); The torsion bar spring (1) is horizontally inserted into the support platform (2), one end of which is fixedly connected to one side of the support platform (2) via a spline, and the other end of which passes through the support platform (2) and is fixedly connected to the torsion arm (3); The horizontal spring (7), horizontal guide rail (8), horizontal slider (6), torsion bar spring (1), and torsion arm (3) are provided in two groups and are symmetrically distributed around the center of the support platform (2).

2. The torsion bar spring quasi-zero stiffness vibration isolator according to claim 1, characterized in that: The torsion arm (3) is connected to the side wall of the support platform (2) via a bearing (4).

3. The torsion bar spring quasi-zero stiffness vibration isolator according to claim 1, characterized in that: The horizontal slider (6) is connected to the torsion arm (3) via a rotating pin (5), and the torsion arm (3) can rotate around the rotating pin (5) as an axis.

4. The torsion bar spring quasi-zero stiffness vibration isolator according to claim 1, characterized in that: It also includes a vertical damper (11), which is connected between the base (12) and the support platform (2).

5. The torsion bar spring quasi-zero stiffness vibration isolator according to claim 1, characterized in that: It also includes a vertical guide assembly, which includes a vertical slider (9) and a vertical guide rail (10), wherein the vertical slider (9) is fixedly arranged on the support platform (2), and the vertical guide rail (10) is fixedly arranged on the base (12), and the vertical slider (9) and the vertical guide rail (10) are slidably connected.

6. The torsion bar spring quasi-zero stiffness vibration isolator according to claim 5, characterized in that: The vertical guide components are provided in two groups and are arranged in centrally symmetrical positions.

7. The torsion bar spring quasi-zero stiffness vibration isolator according to claim 1, characterized in that: The swing range of the angle between the torsion arm (3) and the horizontal guide rail (8) is -45° to 45°.

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