Crash-resistant expansion cylinder buffer with adjustable buffering capacity

The crash-resistant expansion cylinder buffer comprises an expansion cylinder, a conical head, a piston, a limiting valve block, a spring, an adjusting nut and an oil drainage hole, an oil cavity is formed in the expansion cylinder, and a sealing ring is installed to prevent leakage; according to the crash-resistant expansion cylinder buffer, the working threshold value of the crash-resistant expansion cylinder buffer can be flexibly adjusted, and the buffer can obtain large and stable buffering force in the crash-resistant process; and the crash-resistant expansion cylinder buffers can be directly and reasonably installed in series or in parallel to form a crash-resistant expansion cylinder buffer system, so that the crash-resistant capability of the aircraft is enhanced.