Rotating connection part rotating in variable damping mode

The utility model discloses a rotating connection part rotating in a variable damping mode. The rotating connection part comprises a rotating shaft, a guide sleeve, a case and blades. The case is connected with the guide sleeve in a threaded mode. The guide sleeve and the rotating shaft are installed in the case. An inner cavity of the case is divided into a first cavity and a second cavity through the guide sleeve. The guide sleeve is provided with a first channel used for being communicated with the first cavity and the second cavity. The blades are movably installed on the guide sleeve and located on one side, close to the first cavity, of the first channel so as to close or open the first channel. A second channel communicated with the two cavities is further formed between the guide sleeve and the rotating shaft. The rotating shaft is provided with a shaft core with the diameter changing gradually or suddenly. The second channel is formed by the shaft core with the diameter changing gradually or suddenly and the guide sleeve in a defined mode. According to the rotating connection part, damping changes by means of the second channel, damping of the rotating connection part is small in the initial stage of damping rotation and large in the later stage of damping rotation, and therefore the use effect of being fast at first and then slow is achieved.