Vibration isolation system with back pressing devices

Abstract

The invention relates to a vibration isolation system with back pressing devices, and belongs to the technical field of vibration reduction of civil engineering structures. The vibration isolation system is used for controlling influences of vibration of machinery equipment on external environments or relieving influences of vibration of the external environments on the machinery equipment. The vibration isolation system comprises a counterweight bench and vibration isolators, the vibration isolators are located between a base and the counterweight bench which is supported on the vibration isolators, elastic supporting elements are arranged in the vibration isolators, and the elastic supporting elements are at least composed of metal helical springs; and the vibration isolation system further comprises the back pressing devices, each back pressing device comprises a back pressing elastic element and a connecting part, one end of each back pressing elastic element acts on the counterweight bench, the other end of each back pressing elastic element acts on the corresponding connecting part, the connecting parts is connected with the base or vibration isolator bases, and the direction of acting force of the back pressing elastic elements on the counterweight bench is opposite to that of supporting force of the elastic supporting elements on the counterweight bench. Compared with the prior art, according to the vibration isolation system with the back pressing devices, the inherent frequency is easy to control, and the vibration isolation effect is better guaranteed.

Description

technical field [0001] The invention belongs to the technical field of vibration reduction of civil engineering structures, and in particular relates to a vibration isolation system for controlling the impact of the vibration of machine equipment on the external environment or reducing the impact of the vibration of the external environment on the machine equipment. Background technique [0002] In recent years, with the continuous advancement of my country's industrial upgrading, various large-scale rotary equipment are widely used in industrial production and urban construction, such as various generator sets, water pumps, fans, compressors, etc. The problem of vibration and noise control has also been paid more and more attention. Taking the mechanical cooling fan system of an urban gas-fired power plant as an example, the excitation frequency of its motor, gearbox, and blades is very rich. The vibration attenuation in the building structure is small, and it is easy to exc...

AI Technical Summary

Problems solved by technology

[0004] After several years of practice and exploration in many large-scale projects, the law has been discovered: the actual natural frequency of the vibration isolation system is often lower than the theoretical design, and even if the stiffness of the springs is measured one by one and carefully selected to combine the theory required for calculation analysis and design values ​​of stiffness, are unavoidable

[0005] After repeated research and tests, the reason was finally found: multiple steel spring vibration isolators are often used in this type of vibration isolation system at the same time, and each steel spring vibration isolator may contain multiple steel spring elements. Under the cumulative effect of errors and assembly errors, the static load provided by the weight of the equipment is often unable to allow all or most of the steel spring elements to enter the stage of linear change in which the external force they bear is proportional to their own compression displacement, even when the equipment is running. After that, especially when the natural frequency of the vibration isolation system is high (for example, above 10 Hz), the vibration amplitude of the mass block is small, and it is still possible that a considerable part of the steel spring elements are completely or partially in the working stage of nonlinear changes, resulting in the overall vibration of the vibration isolation system. The stiffness is lower than the theoretical value, and the natural frequency is lower, so under the same disturbance, the vibration speed and amplitude are too large, resulting in the vibration value exceeding the standard

[0006] In addition, for some mechanical equipment with harsh application environments, such as ship power equipment, due to the violent shaking of the hull when the wind and waves are strong, the power equipment will inevitably shake. Therefore, the vibration isolation system of the power equipment must not only bear pressure loads, but also It must be able to withstand a certain pull-up load to ensure the safety of the power equipment and the stability of the vibration isolation system, otherwise the power equipment or the vibration isolation device in the vibration isolation system will be in danger of overturning

Similarly, the short prefabricated slab floating track bed also has such problems. When the rail vehicle enters from one end, due to the short prefabricated slab’s light weight, it will produce a seesaw effect, that is, the other end of the short prefabricated slab has an upward warp. If the trend cannot be effectively controlled, the vibration isolator on the tilted side of the short prefabricated slab will have insufficient pressure, which will easily lead to problems such as the displacement of the short prefabricated slab or the overturning of the elastic components in the vibration isolator, which will bring serious problems to daily operations. Security risks

In order to ensure safety, the traditional method is to use rigid limit, which inevitably forms a vibration short circuit, which greatly reduces the vibration and noise reduction effect of the vibration isolation system

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