A three-dimensional vibration isolation device suitable for low frequency vibration

Abstract

The invention aims at providing a three-dimensional vibration isolation device applicable to low-frequency vibration. On a horizontal plane, a decoupling bracket, steel shafts, and an aluminum slide block realizes decoupling of vibration displacement in X and Y directions; a large circular permanent magnet and a small circular permanent magnet serve as negative stiffness elements, and springs serve as positive stiffness elements, thereby forming a low-frequency vibration isolation system of the horizontal plane; in a vertical direction, oblique springs serve as negative stiffness elements due to geometrical characteristics, and a support spring serves as a positive stiffness element to form a low-frequency vibration isolation system in Z direction; and a three-dimensional low-frequency vibration isolation system is formed by combining the two systems. According to the device, the permanent magnets or the springs serve as the negative stiffness elements or positive stiffness elements, lower-frequency vibration isolation is achieved; displacement decoupling in the X, Y and Z directions is achieved; lower dynamic stiffness in the Z direction and an XY plane can be obtained, and a greater carrying capacity can be ensured at the same time; the input energy is not required; and a static balance position can be adjusted to ensure that the vibration occurs near zero stiffness.

Description

technical field [0001] The invention relates to a vibration isolation device. Background technique [0002] With the continuous development of industrialization, people's requirements for vibration isolation are getting higher and higher, such as the requirements for the quietness of the environment in the fields of precision measurement and processing. Both internal and external vibration disturbances of mechanical equipment are important factors that reduce machining accuracy and surface quality. The interference frequency of the traditional passive vibration isolation system to the outside world is greater than the natural frequency of the vibration system. It can effectively isolate medium and high frequency vibrations, but the ability to isolate low frequency vibrations is poor. However, the vibration frequency that adversely affects ultra-precision processing equipment is in the range of 0.5-70Hz. In order to improve the low-frequency vibration isolation efficiency ...

AI Technical Summary

Problems solved by technology

However, there are problems with this method: 1. The rubber sheet is prone to aging and fracture after being stretched for a long time; 2. The static equilibrium position of the structure cannot be adjusted, and it cannot be ensured that the vibration occurs near the equilibrium position; 3. Magnets are used as the vertical direction. Positive stiffness system, the static linear bearing capacity is poor, the static bearing capacity of the rubber sheet in the horizontal direction is poor, and it is prone to large deformation

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