Cylindrical high-static low-dynamic low-frequency passive vibration isolator

Abstract

The invention provides a cylindrical high-static low-dynamic low-frequency passive vibration isolator. The cylindrical high-static low-dynamic low-frequency passive vibration isolator comprises a negative-rigidity cylinder, an objective table, a buckling beam circular ring sleeve, a cam, a guide plate, a bottom cylinder, a supporting column, a roller, a butterfly spring and a connecting plate. According to the principle that the positive rigidity and the negative rigidity of parallel elastic elements are offset, the rigidity of the whole device at the balance position is approximately zero, the inherent frequency is as low as possible, and therefore vibration isolation of low-frequency or ultralow-frequency vibration is achieved. The bearing mass is large, the dynamic rigidity of the wholedevice can be reduced, the occupied size is small, the vibration isolation capacity is high, and the vibration isolator is very suitable for low-frequency or ultralow-frequency vibration isolation. The butterfly spring is small in deformation displacement, large in bearing capacity, small in occupied space and not prone to instability. Compared with a traditional linear spring, the buckling beamcircular ring sleeve has good impact resistance, the buckling beam circular ring sleeve is matched with a cam-roller mechanism, the instability phenomenon of a linear spring in the pressing process can be effectively avoided, the supporting column and the roller which are in threaded connection can facilitate cam replacement, and the height of the roller can be adjusted through threads.

Description

technical field [0001] The invention belongs to the technical field of vibration isolation devices, in particular to a cylindrical high-static, low-dynamic, low-frequency passive vibration isolator. Background technique [0002] Traditional linear passive vibration isolators have excellent vibration isolation effects in the field of medium-frequency and high-frequency vibrations. However, with the urgent need for high-precision instruments to isolate low-frequency and ultra-low-frequency vibrations, traditional linear vibration isolators are limited by their own inherent properties. It has been unable to afford the isolation of low frequency vibration. According to the theory of linear vibration: when the frequency of the external excitation (force or displacement) is greater than twice the root of the natural frequency of the vibration isolation system, the linear system will perform the function of vibration isolation. Therefore, the linear system needs to reduce its own n...

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Problems solved by technology

Most of the previous low-frequency passive vibration isolators are large in size, poor in precision, and large in error,

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