Lifting device, boarding bridge and boarding bridge

The invention provides a lifting device, a boarding bridge and a boarding bridge. The lifting device comprises a support, a lifting table and a lifting assembly. The lifting assembly comprises a guide rod, a nut and a driving unit; the upper end of the guide rod is movably connected to the support so that the guide rod can swing. The nut comprises a rotating piece and a shell which are rotationally connected, the rotating piece is in threaded connection with the guide rod, and the shell is connected to the lifting table. The driving unit is used for driving the rotating piece to rotate relative to the guide rod so that the nut can ascend and descend relative to the guide rod and drives the lifting table to ascend and descend relative to the support. Through the design, the radial pressure borne by the guide rod can be reduced, the guide rod is not prone to being pressed and bent, and therefore the service life of the guide rod is prolonged. 本申请提出一种升降装置、登船桥及登机桥，升降装置包含支架和升降台以及升降组件；升降组件包含导杆、螺母及驱动单元；导杆上端活动连接于支架，以