When the motor is switched on, the bucket mounted on bucket belt does circulating motion along the leg from the bottom up; materials enters the bucket and conveys to the head section of the elevator when filled, When the bucket belt turns around the head pulley, materials are ejected from the bucket under the action of centrifugal force and gravity. By such a repeated circle the materials in bottom are lifted to a given height and then discharged, so as to meet a requirement of vertical lifting.