Vibration damping fastener system for multi-layer pad

Abstract

The invention discloses a vibration damping fastener system for a multi-layer pad. The vibration damping fastener system comprises an elastic layer and a pad, and the elastic layer comprises a lower rail elastic pad (6) and a first elastic layer (4); the pad includes a first pad (5) and a second pad (3), and the first pad (5) is provided with a rail connecting piece (5.1) connected to a rail for fixing the rail (8); the elastic layer comprises a second elastic layer (2); the vibration damping fastener system comprises, in order from top to bottom, the lower rail elastic pad, the first pad (5),the first elastic layer (4), the second pad (3) and the second elastic layer; the invention proposes a compression-based high-level vibration damping fastener, the fastener adopts a spacing arrangement mode of the pad and the elastic layer, the elastic layer is formed into a series form, and low vertical stiffness is obtained so as to achieve higher damping effect; the rail can directly fall to the ground, ensure the safety of use, and utilize the market to accept the promotion.

Description

technical field [0001] The invention belongs to the field of rail transit and relates to a vibration-damping fastener system for multi-layer backing plates. Background technique [0002] Environmental problems caused by track and rail vibration are one of the main issues affecting the development of urban rail transit, and track dampers are one of the main vibration reduction measures currently used in rail systems. The lower the vertical stiffness of the fastener, the better the vibration isolation effect. The current rail transit conditions are becoming more and more diverse, and people's requirements for the environment are getting higher and higher. Ordinary vibration-damping fasteners (vertical stiffness 40-200kN / mm), and even medium damping fasteners (15-40KN / mm) can no longer meet the requirements of special locations or high damping capacity (10-15dB). Therefore, rail fasteners with low vertical stiffness have received more and more attention in recent years. [00...

AI Technical Summary

Problems solved by technology

However, the rail waist support method will make the rail more prone to deflection, and the rail suspension support method cannot guarantee safety in the event of rail breakage from a visual point of view, so its acceptance in the market is low

[0005] Although the vibration damping fasteners (CN2630303Y, CN205134109U, CN203755094U) of the existing double-layer backing plate commonly used also adopt the vibration damping method that the elastic layer and the backing plate are arranged at intervals, the stiffness of the elastic layer under the rail usually reaches more than 50kN / mm (to ensure the safety of elastic deformation), and the stiffness of the middle elastic layer cannot be reduced infinitely (excessive deformation will lead to accelerated aging and fatigue of the elastic layer, and the life cannot meet the requirements), so it can only achieve a moderate vibration reduction effect

[0006] Through the above analysis, it can be seen that although the common damping fasteners and medium damping fasteners commonly used at present are widely used and have various structures, they cannot meet the requirements of high-level vibration damping. Plates and other high-cost and long-term vibration damping methods; and high-grade vibration damping fasteners currently only have the form of suspension support, but due to low market acceptance, the application is greatly restricted

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