Easily-assembled self-locking energy-absorbing device of dumbbell-shaped thin-walled-tube structure

The invention discloses an easily-assembled self-locking energy-absorbing device of a dumbbell-shaped thin-walled-tube structure. The easily-assembled self-locking energy-absorbing device is of the dumbbell-shaped thin-walled-tube structure and made of metal, the combined structure is composed of a plurality of sub dumbbell-shaped thin-walled-tube structures arranged in a staggered mode, each sub dumbbell-shaped thin-walled-tube structure is composed of two thin boards arranged in parallel and connected with two hollow circular tubes, and the flat boards are arranged perpendicular to the impact direction. Due to the design of the dumbbell-shaped section, self-locking between the sub dumbbell-shaped structures is achieved in the impact process and the shortage that a restraining device needs to be installed on the transverse border of a traditional energy-absorbing device or a connecting device needs to be added between every two sub structures is overcome. Therefore, the assembly and disassembly cost is great