Bran thresher double tuned mass damper, compound vibration reduction and isolation device and its realization method

Abstract

The invention relates to bran finisher double-turned mass dampers, a combined vibration reduction and isolation device and an implementation method. The double-turned mass damper consist of double-cantilever beams and turned mass blocks at two ends of the double-cantilever beams; the combined vibration reduction and isolation device consists of a vibration isolation system and a tuned mass damper; the vibration isolation system consists of rubber vibration isolators, a vibration isolation steel plate and a steel spring vibration isolator; the rubber vibration isolators are installed on the upper surface of the vibration isolation steel plate; the steel spring vibration isolator is arranged on the upper bottom surface of the vibration isolation steel plate; the rubber vibration isolators are arranged at four corners of a bran finisher; and the double-turned mass dampers are arranged at two ends of the vibration isolation steel plate and are symmetrically arranged by a central line of the vibration isolation steel plate. According to the combined vibration reduction and isolation method, the upper and lower vibration isolation structures (the rubber vibration isolators and the spring vibration isolator) cooperate with the turned mass damper, so that additional mass of the vibration isolation structure is reduced, and a good vibration isolation effect can be achieved due to the small mass of the vibration isolation structure.

Description

Technical field [0001] The invention relates to a double-tuned mass damper of a bran crusher, a composite vibration reduction and isolation device and an implementation method thereof, and belongs to the technical field of equipment vibration isolation. Background technique [0002] The bran beater is one of the important equipment for the industrial production of flour mills. Under the impact of the high-speed rotating adjustable beater, the bran flakes are thrown to the buffer plate and the elastic sieve. Under the repeated action of the beater, the flour is removed from the bran flakes. In the middle separation, the speed of the punching rotor is 1000~1100r / min, and the corresponding actual operating frequency is generally between 16Hz~19Hz. The first-order vertical natural vibration frequency of the floor slab of an industrial plant is generally between 15Hz and 20Hz, which just overlaps with the operating frequency range of the bran mixer, and it is prone to coupling vibrati...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of poor single vibration isolation efficiency, some researchers have proposed to implement secondary vibration isolation structures or multiple vibration isolations on the equipment, that is, one vibration isolation structure is placed and superimposed on another vibration isolation structure, or multiple vibration isolation structures Structurally

But there are also many shortcomings: the height of the vibration isolation base of the equipment is increased, which may easily lead to the instability of the center of gravity of the equipment, and the torsion and eccentricity are prone to occur during work; the natural frequencies of multiple vibration isolators are not strictly staggered, and resonance will still occur

The vibration isolation base requires a large rigid mass, which increases the additional mass of the equipment, and the installation of the vibration isolation structure is cumbersome, and the maintenance of the vibration isolation structure in the later stage is also inconvenient, which is not conducive to the development of low-value industrial equipment such as bran threshers. It is expected to be widely used in high-precision equipment

[0006] The Chinese invention patent with application number 201110057599.9 discloses a small mass ratio vibration reduction structure and its implementation method, specifically a single-layer vibration isolation and dynamic vibration absorber vibration isolation method, which can realize single-point vibration absorption of equipment, but cannot suppress Vibration during start-up and shutdown phases of equipment, even when working at non-rated power

In addition, the patent installs the dynamic vibration absorber directly on the working equipment, which can only reduce the unstable vibration of the equipment itself, and cannot achieve the isolation of the vibration energy transmitted to the floor

[0007] In addition, the traditional vibration isolation structure has only little damping or even no damping. When the equipment is started and shut down, the operating frequency always coincides with the natural frequency of the vibration isolation structure. At this moment, the system resonates, although the overlapping time Generally, it will not be too long to cause divergent vibration of the structure, but it may reach a large value, which is not conducive to the long-term normal operation of the equipment.

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