Damper with double-pipe structure

The damper comprises a door frame, a first sliding rail is fixedly installed at the top of one side of the door frame, the first sliding rail is of a hollow pipeline type structure with an opening in the bottom face, wheel grooves are formed in the two sides of the bottom of the inner wall of the first sliding rail, a door plate is arranged at the bottom of the first sliding rail, a sliding block is fixedly installed on the top face of the door plate, and the sliding block is connected with the sliding rail. The sliding rail I is provided with a sliding block, rollers are uniformly arranged on the two sides of the sliding block, the door plate slides along the sliding rail I through the sliding block, and a speed reduction structure is arranged on the inner wall of the sliding rail I. The sliding door damper aims at solving the problems that an existing damper is short in buffering distance and poor in buffering effect when a door body is heavy. Compared with a one-section structure of a sliding rail damper,