Passive dynamic vibration absorber and assembling method thereof

Abstract

The invention relates to a passive dynamic vibration absorber and an assembling method thereof. The passive dynamic vibration absorber comprises an upper sleeve, an adjusting piece, an upper pressing block, an upper reed, a middle pressing block, a lower reed, a lower pressing block, a lower sleeve and a core shaft. Through holes are formed in the center positions of the lower reed and the upper reed, the lower sleeve, the upper sleeve and sleeve fasteners are fixed to the core shaft, the adjusting piece is connected to the upper end of the upper reed through the upper pressing block, the middle pressing block is connected between the upper reed and the lower reed, the lower pressing block is connected to the lower end of the lower reed, through holes are evenly distributed in the outer ring of the lower reed and the outer ring of the upper reed, the through holes are consistent with peripheral through holes of the lower pressing block, the middle pressing block and the adjusting piece and peripheral threaded holes of the upper pressing block in position, and the parts are tightly pressed together through a peripheral fastener. The passive dynamic vibration absorber has the advantages of good transverse stability, fine frequency modulation and limiting function, and can effectively suppress the line spectrum vibration of equipment.

Description

technical field [0001] The invention relates to a passive dynamic vibration absorber, belonging to the technical field of vibration and noise control. Background technique [0002] In order to reduce the vibration transmitted from the power equipment to the outside world, a vibration isolator is usually used to isolate it, but the characteristic line spectrum of the vibration still exists and is relatively prominent after the vibration passes through the vibration isolator. For the single-frequency line spectrum, the use of a dynamic vibration absorber can often bring very obvious effects. By installing a dynamic vibration absorber with the same natural frequency as the frequency of the single-frequency line spectrum, the vibrator of the vibration absorber resonates, thereby taking away the vibration of the main vibration system. Vibration energy, to achieve the purpose of reducing the vibration energy of the characteristic line spectrum of the equipment transmitted from the...

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Problems solved by technology

[0003] The patent number is CN201710751468.8, an invention patent named "a spring-type vibration absorber", which discloses a spring-type vibration absorber, which consists of a mass element, a stiffness element, a guide rod, a positioning sleeve and a locknut. The shock absorber of this structure uses a coil spring as the stiffness element. On the one hand, the lateral stiffness is poor, and on the other hand, the damping is large: first, the coil spring itself has a large structural damping, and second, it is easy to occur between the mass element and the guide rod. Contact brings frictional damping. For equipment with a low single-frequency vibration level, excessive damping makes it difficult for the installed vibration absorber to resonate, resulting in a greatly reduced vibration-absorbing function.

[0004] The patent number is CN201620650885.4, a utility model named "Frequency Adjustable Diaphragm Type Vibration Absorber", which discloses a frequency adjustable diaphragm type vibration absorber, which mainly consists of a support rod, an outer gasket, a diaphragm, an inner gasket, and a mass block , FM components, screws, flat washers, etc. The vibration absorber uses a diaphragm as the elastic element, and the diaphragm is provided with a hollow structure formed by more than one circle of concentric arc grooves that are periodically distributed around the center of the circle according to the set period. It is difficult to control the law of the stiffness characteristics of this structure. In addition, if the shock absorber has an infinite structure, if it encounters a large impact, human stepping, heavy objects falling, etc., the diaphragm may permanently yield. Even broken, affecting the life of the shock absorber

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