The invention discloses a butting method for a sealing device and provides an expanding method of an
awning method. The expansion method comprises the following steps:
laser distance meters are started to measure the distance from a flexible frame to an
airframe of an
airplane, when a boarding bridge moves towards the
airplane in the vertical direction and approaches to the
airplane to be butted with in a certain distance, the boarding bridge is temporally stopped from being close to the airplane; the flexible frame is controlled to be deformed by utilizing the distance measured by the multiple
laser distance meters and actuators, and the deformed flexible frame is enabled to have the same curvature of the airplane
skin to be butted; the boarding bridge is controlled to continuously move forwards, and when the
laser distance meter at the front end of a floor measures that the distance reaches the preset value, the boarding bridge is braked; and a controller controls a winding mechanism to release an
energy storage device, so that a butting frame is enabled to be tightly pressed on the airplane
skin in a fitting manner through the
energy storage device. With the adoption of the expanding method for the
awning device, the
air tightness and safety are improved.