An adjustable pretightening force double-layer shock-absorbing fastener system

Abstract

The invention belongs to the field of urban mass transit, and discloses an adjustable pre-tightening force double-layer vibration attenuation buckle system. According to the adjustable pre-tightening force double-layer vibration attenuation buckle system disclosed by the invention, pre-tightening force inter-locking on a bottom plate elastic insulating pad (6) is formed in a gap between an upper bottom plate (5) and a lower bottom plate (7); the adjustable range of the pre-tightening force is 0.1-30KN; an adjusting method comprises the following steps: adjusting the locking height of a bottom plate connecting sleeve (4), or setting a pre-tightening force adjusting gasket I (3a) between the upper end surface of a baffle side (12) and a locking cover plate (2), or setting a pre-tightening force adjusting gasket II (3b) between the lower end surface of the baffle side (12) and the upper end surface of the upper bottom plate (5), or increasing the thickness of the baffle side (12). By adopting the system, the problem that the pre-tightening force is reduced as the double-layer vibration attenuation buckle system is worn in the application process or even crack occurs between the elastic insulating pads of the bottom plates and the upper and lower bottom plates are avoided, and the train security is ensured.

Description

technical field [0001] The invention belongs to the field of urban rail transit, and in particular relates to a double-layer damping fastener system with adjustable pretightening force. Background technique [0002] In recent years, in the field of domestic subway transportation, double-layer vibration-damping fasteners (self-locking track double-layer vibration-damping and noise-reducing fasteners, patent number CN2630303, utility model, application date 2003.05. Therefore, it has relatively excellent vibration damping performance and has been widely used. However, the design tolerance of the double-layer damping fastener needs to be controlled very precisely, otherwise it is easy to appear the gap between the upper and lower iron backing plates of the fastener. [0003] At the same time, the patent No. ZL20122068 2492.3 proposes an easily disassembled and separated double-layer vibration-damping fastener system, which uses an upper base plate, a base plate connecting slee...

AI Technical Summary

Problems solved by technology

However, the design tolerance of the double-layer damping fastener needs to be controlled very precisely, otherwise it is easy to appear the phenomenon of separation between the upper and lower iron backing plates of the fastener

[0003] At the same time, the patent No. ZL20122068 2492.3 proposes an easily disassembled and separated double-layer vibration-damping fastener system, which uses an upper base plate, a base plate connecting sleeve, a non-linear design double-sided convex elastic insulating pad, and a lower base plate through an interlocking cover plate. The pre-assembly of the product has been realized. The fastener has the characteristics of low rigidity under low load, ensuring vibration reduction, high rigidity under high load, and ensuring driving safety. It can give full play to the elasticity of the rubber pad in the middle of the fastener, ensuring that the fastener Excellent vibration damping performance; the set bottom plate connection sleeve will not cause lateral shear to the anchor bolts, ensuring the safety of driving; the adjustment pre-tightening force required for the fastener during use, when the structure of the fastener is determined, its pre-tightening force The tightening force is mainly determined by the gap between the upper base plate and the lower base plate; if the fasteners are worn during use, the gap between the upper base plate and the lower base plate will increase, the pre-tightening force will decrease, and even the elastic insulation of the base plate There will be a gap between the pad and the upper and lower bottom plates, which will change the stiffness of the fastener or fail to work normally, affecting the safety of the train

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