Metal energy absorption device

Abstract

The invention discloses a metal energy absorption device which comprises a metal energy absorption pipe and is structurally characterized in that the metal energy absorption device further comprises a reducer pipe structure, a punch structure and an annular groove base; the reducer pipe structure comprises an upper metal pipe, a middle metal pipe and a lower metal pipe which are sequentially connected in a smooth transition mode; the inner diameter of the upper metal pipe is larger than that of the middle metal pipe and smaller than that of the lower metal pipe; the lower end of the metal energy absorption pipe is sleeved with the upper metal pipe; the punch structure is located in a lower cavity of the reducer pipe structure; a wedge-shaped structure is arranged on the periphery of the punch structure; the punch structure is connected with the reducer pipe structure through the wedge-shaped structure; and the annular groove base is fixedly connected to the bottom of the punch structure. According to the metal energy absorption device, energy absorption in four forms of contraction, bulging deformation, tearing and curling deformation and in four stages is achieved for the metal energy absorption pipe, impact kinetic energy is dissipated, the whole process is orderly and controllable, and the energy absorption efficiency is high.

Description

technical field [0001] The invention relates to the field of rail vehicle passive safety protection, in particular to a metal energy-absorbing device. Background technique [0002] With the rapid development of the rail transit industry, the safety of rail vehicles has been paid more and more attention. As the most common energy-absorbing structure in rail vehicles, metal anti-climbing energy-absorbing devices can effectively absorb impact kinetic energy when a collision occurs, and play a decisive role in the safety of rail vehicles and passengers. Therefore, energy-absorbing devices with excellent impact characteristics are widely studied and applied. [0003] There are many inventions and creations about anti-climbing energy-absorbing devices in the prior art. For example, the invention patent CN109515468 A provides an energy-absorbing anti-climbing device for rail vehicles. The energy-absorbing principle is through planing of metal pipes and damping of fluids. For ener...

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Problems solved by technology

[0003] There are many inventions and creations about anti-climbing energy-absorbing devices in the prior art, such as the invention patent CN109515468 A which provides an energy-absorbing anti-climbing device for rail vehicles, The principle of energy absorption is to dissipate energy through planing of metal pipes and damping of fluid. This technical solution combines the advantages of cutting energy absorption and hydraulic energy absorption, and improves the energy absorption and anti-eccentric load of the device. Its late resistance resistance stability is poor, and the stroke utilization rate is low; Another example is the invention patent CN111055874B which provides a multi-level anti-collision buffer structure, which can perform multi-level buffering. The principle is to cut the protrusions on the metal square tube wall and the metal The collapse of the tube is used to dissipate energy. This technical solution adopts a multi-stage scalable structure, which occupies a small space and has a good energy absorption effect, but its resistance stability is poor and the initial peak value is high.

[0004] The anti-climbing energy-absorbing devices in the prior art, especially for anti-climbing energy-absorbing devices containing metal profiles, have poor controllability during the compression deformation process, and the impact The force fluctuates greatly and the resistance is unstable, which often leads to low energy absorption efficiency

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